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Watch trailer on Steam ↗Undying Flame
Per Sidera Industries · Published by Per Sidera Industries · Official site ↗
4 user reviews — 75% positive (4 reviews)
Last updated 28 Sept 2026
Keep the fire alive, commit to a build, and carry 91 relics through a campaign that transforms from Fire to Star to Void. No ads or purchases.
Action, Strategy · 2026 · More free games
About this game
When the fire dies, so do you.
Undying Flame is a top-down wave-survival rogue-lite built around one living campfire. Creatures march out of the darkness. Shoot them. Collect the wood they drop. Feed the flame. Survive long enough to discover what the fire becomes.
There is no health bar. The fire tells you everything. A healthy flame is bright, warm, and loud, with embers flying and logs crackling. A dying flame shrinks, dims to red, and goes quiet. Watch the color. Listen to the crackle. Feed it before it is too late.
Choose three. Commit to a build.
Every shop presents exactly three upgrades. Build around seven families: Rapid Shot, Multishot, Explosives, Piercing, Turrets, Hearth, and Guard. Each family branches into specialized upgrades and a mastery. Lock a card, reroll the shop, or spend now and live with the path you chose.
During the Fire, you can commit to three families. Reaching the Star adds a random fourth family. Reaching the Void adds a random fifth. Four endless prestige tracks keep scaling across the campaign, so your build never stops growing.
91 relics. 10 synergies. 6 Ignitions.
Every five waves, choose one of three relics across Fire, Bullets, Enemies, Economy, Turrets, Light and Dark, and Cursed categories. Cursed relics can teleport bullets, create mirror shots, reshape enemies, or bury the world in darkness.
Pair the right relics to reveal 10 named synergies. Combine a mature shop build with the right relic catalyst to trigger one of 6 Ignitions. These are new effects created by the build you assembled, not upgrades chosen from a menu.
Place Watchtowers, Forges, Shrines, and Beacons. Automate collection. Turn every kill into another kill. Build for speed, spread, explosions, piercing, turrets, sustain, defense, or something that should not work but does.
Every fifth wave has a purpose.
Swarm waves test crowd control. Hunt waves test aim and reaction. Siege waves test sustained damage and defense. Trials expose a weakness in your build. Every wave 25 Climax brings those lessons together in a major combat event.
Strong builds get room to breathe after a major power spike, but the darkness adapts. Survive waves without taking damage and the next wave sends more enemies. Get hit and the pressure begins easing back toward normal.
The campaign transforms with you.
The run begins at the campfire. Survive long enough and the Fire becomes the Star. Push farther and the Star collapses into the Void. Your build and relics carry forward while enemies, resources, visuals, and upgrade choices evolve around them.
Gold and Wood become Ore and Hydrogen. The final transformation replaces Ore with Antimatter. The same build must keep adapting as the scale and pressure change.
The Void changes the verb.
Standalone Void runs are a different game. Shooting is replaced with gravity. Pull orbiting matter to your cursor, drag it toward a growing black hole, and spend what it consumes across a 56-node upgrade tree.
Four rulesets change your priorities, not just the numbers. Preserve whole bodies, hunt valuable matter, build fragment cascades, or race the black hole's evaporation.
Four ways to face the dark.
CAMPAIGN
Play the complete Fire to Star to Void run. Choose the standard campaign or one of 14 challenge campaigns with altered rules and permanent rewards.
THE VOID
Grow a black hole through four priority-changing rulesets and a 56-node upgrade tree.
IDLE
Let automation carry the fight while enemies scale to your upgrade power instead of wave number. Experiment with relic combinations while the fire burns twice as fast.
DAILY
Play one shared seed with one attempt each day and compare your result on the leaderboard.
A run ends. The game remembers.
Climb from Ascension A0 to A10. Unlock Warden, Gunslinger, Demolisher, Marksman, Pyromancer, and Berserker through Ember Trials. Continue ascending to earn 12 Ascendant and Eternal mantles that further change how those classes play.
Spend permanent Fire, Star, and Void resources. Unlock 12 fire skins. Complete 30 achievements. Fill the relic and synergy archives, bestiary, and run history. Every run leaves something behind.
[h2>A soundtrack that follows the run.[/h2]
The 36-track original soundtrack reacts to the current phase, danger, and wave intensity. Use the in-game music player to pause, skip, or revisit tracks, or switch to the fully synthesized procedural soundtrack.
Built for how you play.
Full keyboard and mouse, controller, Steam Deck, and touch support. Automatic last-input detection keeps prompts current. UI scaling, aim assist, deadzone controls, reduced effects, portrait and landscape layouts, and 28 languages keep the game readable wherever you play.
[h2>No microtransactions. No ads.[/h2]
Buy the game once. Leaderboard submission is optional.
Nothing burns forever. Hold the dark back while you can.
System Requirements
Will my PC run this? →Minimum
- OS: Windows 10
- Processor: Intel Core i3 2.0 GHz or equivalent
- Memory: 512 MB RAM
- Graphics: Any GPU with DirectX 11 support
- DirectX: Version 11
- Storage: 300 MB available space
Recommended
- OS: Windows 10 / 11
- Processor: Intel Core i5 or equivalent
- Graphics: Any dedicated GPU
- DirectX: Version 11
- Storage: 300 MB available space
Supported Languages
Latest news
Patch NotesOfficial
Polish & Performance Update
⚡ PerformanceBig speedup on low-end hardware. The heaviest rendering effect (the glow/shadow) now turns off automatically on weaker devices, and the game renders at a lighter resolution and scales it up. Budget phones and older PCs get much better frame rates, and stronger hardware looks exactly the same as before. Faster auto performance mode. The game spots a poor fps and drops into Low Spec mode, instead of polling over larger periods of time. ♿ Accessibility & ControlsReduced-motion support. If your system is set to reduce motion, screen shake and particle bursts start off. You can turn them back on anytime. Full keyboard menu navigation. Arrow keys move through every menu, Enter selects, and Left/Right change sliders. No mouse needed. Keybind Feed key. You can now remap the keyboard key that feeds the flame in Settings. Higher text contrast on menu descriptions and hints so they're easier to read. Touch press feedback. Buttons and cards now react clearly when you tap them. 🐛 Bug FixesFixed quitting to menu from the pause screen losing your run. Your progress saves properly now, and Continue picks up where you left off. Clearer quit warnings. Quitting a Daily run now warns you the run will be lost. Saveable modes tell you your progress is safe. 🔊 AudioFixed the default volume. The game used to launch way too quiet on a fresh install. The default mix is set to a proper level now. 🍎 macOS & 📱 MobileUndying Flame is coming to Mac, iOS, and Android. Native builds for all three exist and are in testing. They'll arrive with the full launch. Thanks for playing, and for the feedback that drove this update. Keep it coming in our Discord.Read full article on Community Announcements (Persidera Industries)Community & EventsOfficial
🔥 Steam Next Fest is Here: Play the Undying Flame Demo Now!
The gates are officially open. Steam Next Fest has begun, and the playable demo for Undying Flame is live right now.If you have been following our updates, this is your chance to step into the dark and test your survival instincts. We are incredibly excited to see how far you can get!Here is what you will be jumping into when you download the demo today: What is Undying Flame?Undying Flame is a tense, strategy defense game built entirely around one core word: Defend.Instead of watching a traditional health bar, you have to watch your flame. The fire itself tells you how you are doing. When your flame runs low, the darkness visibly tightens around the edges of your screen and pulses like a faltering heartbeat. You will start small. You will scrounge for wood, construct defenses, and upgrade your turrets to hold back the things hiding in the deep night.If you protect your fire long enough, it outgrows the world. It will collapse and detonate into a newborn star where it stands. The map boundaries burn clean away, your camera zooms out, and your strategy will need to adapt.Dive in and tell us what you thinkWe need your eyes, your feedback, and your strategies to make this game the best it can possibly be. Try out different upgrade trees, discover powerful synergies, and see how long you can keep the light burning.Once you have played a few runs, hop into our community hub to share your thoughts, drop your feedback, or report any bugs you run into. Every piece of input helps the fire burn cleaner.Go grab the demo, good luck out there, and let us know how far you can push your build! 🔥Read full article on Community Announcements (Persidera Industries)AnnouncementsOfficial
The Flame Evolves
✨ NEW: Stellar IgnitionThe transition has been reborn. No more camera tricks. When your fire outgrows the world, it ignites where it stands: the flame gathers, collapses, and detonates into a newborn star. You'll know it when it happens.Your build ascends with you. Every upgrade level you bought in the Fire phase now collapses into the star as starting Precious Metals. And your turrets aren't scrapped, they're pulled into orbit as orbital lasers. A hard-built run ignites armed. ✨ NEW: The game now teaches itselfTutorial reworked top to bottom. It now tells you what this game is: the dark is alive, it wants the fire out, and the fire is your life. Watch the flame gutter and die in front of you, then save it yourself. Each lesson breathes, nothing is rushed, and it closes with a proper fade instead of a hard cut.The dark closes in. When your fire runs low, the darkness visibly tightens around the edges of the screen and pulses like a faltering heartbeat. You will never again die without knowing you were dying.Panic now comes with a plan. "FIRE IS DYING" tells you the fix: FEED IT with your feed key, or NO WOOD, KILL FOR DROPS when you're empty.The Star explains itself. First ignition? The game tells you what Hydrogen and Precious Metals are, right when you need to know. Once, and never again.Two paths, one fate. The cosmic shop now tells you that your purchases shape what your star becomes. What it becomes... that you'll discover. ⚖️ BALANCEThe Pre-Star wall has been softened. We ran hundreds of simulated runs, at every skill level. Enemy density through that band is trimmed up to ~12%. Skilled runs can now crest into the Star, early waves and endless scaling are untouched.Stellar Wind is a real defense now. The Wind tree's slow aura is massively buffed, up to 75% slow at max rank. The "push, burn clean, endure" path can finally hold off a swarm the way Accretion always could. 🐛 BUG FIXESFixed: the tutorial could soft-lock if an enemy reached the fire before you shot ...Read full article on Community Announcements (Persidera Industries)AnnouncementsOfficial
Demo Available Now, Play Undying Flame
The Undying Flame demo is live. Defend a single campfire against waves of creatures that emerge from the dark. The fire is your health bar AND your weapon. There is no HP meter, you read the fire itself.Whats in the demo.🔥 Campaign Mode, wave cap at 50🎯 First 4 campaign challenges🗝 Locked previews of Idle Mode, Daily Challenge, and the Archives.40-60 minute runs. 90 relics. 8 enemy types. No microtransations. No bloat.Joining Steam Next Fest June 15-22 with livestreams, dev chat, demo updates throughout the week.Nothing burns forever.- Persidera IndustriesRead full article on Community Announcements (Persidera Industries)
