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Watch trailer on Steam ↗Slime Slayer
BOOSTED BYTES · Published by BOOSTED BYTES · Official site ↗
Positive — 100% positive (11 reviews) · 9 achievements
Last updated 27 Sept 2026
Slime Slayer is a Roguelite Spellbuilder dead set on the destruction of all slimes! Craft unique spells with powerful modifiers and elemental effects to conquer this slime-infested world!
£5.89
Lowest price we've ever recorded
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Price history
Action, Indie, RPG · 2025 · More £5 - £15 games
Embark on a dynamic roguelike adventure where your choices shape your magic. In Slime Slayer, build unique spells with elemental effects to conquer a world overrun by slimes, all crafted by BOOSTED BYTES in 2025.
About this game
Slime Slayer is an action-packed roguelite where you exterminate EVERY LAST SLIME! Craft unique character builds in every run with compounding modifier runes.
Features
7 Base Abilities, each with 5 Elemental Variants Create your spells with a base and element! Fireball? LightningBall? Ice Meteor? Void Meteor? Build your spell how you want it!
Pick Your Element: Every spell can be evolved with every element, and every element is mechanically distinct! Learn the strengths and weaknesses of each element and how to best combo them to craft a slime-killing machine!
Build Your Spells: All modifier runes can apply to all skills, and each rune compounds in a way where sequence matters. Learning how different runes build off of each other allows you to create unique and incredibly deadly combinations to slay even the most powerful slimes!
11 Unique slimes, and 7 different bosses Traverse between the Forest, Desert, Crystal Caves, Floating Isles, Arctic, Volcano, and Void Zones to encounter unique slimes and bosses! Each Combat room can RuneCharged and HeartCharged, empowering all slimes inside. The more powerful the enemies in a room, the greater the reward!
Relics: Take your build to the next level with distinct Relics! Relics are non-stacking unique global modifiers that empower your builds, giving you new paths to power with every run!
Multiple Gameplay Difficulties: Up for the challenge? Test your skills in making the strongest build you can in Hard mode or Hell mode! Then test your build's power in the Gauntlet!
System Requirements
Will my PC run this? →Minimum
- OS *: Windows 7 or newer
- Processor: 2.5 Ghz or better
- Memory: 4 GB RAM
- Storage: 2 GB available space
Supported Languages
Latest news
AnnouncementsOfficial
We're live!
1.0 Is live now! Thanks everybody for following along through all of development! I hope you have tons of fun and kill lots of slimes!Read full article on Community Announcements (steven)AnnouncementsOfficial
Development Updates!
Slime Slayer is still in development! After a brief pause due to some marketing deadlines, I'm back at it! Slime Slayer will be participating in Steam Next Fest next week and should be on track for a fall launch! Here's what I have in the works right now, alternate base abilities! After you unlock your first alternate ability, you'll be able to slot any combination of abilities into any ability slot. This is the new Meteor ability! Meteor is a charged skill that does more damage and has a greater area of effect the longer you charge it. With the right setup, a fully charged Meteor can wipe through a wave of enemies. Once this ability is done, I'll get started on the next charged ability Thanks for reading and sticking around for the intermission in development! {STEAM_CLAN_IMAGE}/43763858/9814f6733faee8e9549932d90c299ac7190ad29e.gifRead full article on Community Announcements (steven)Patch NotesOfficial
Last Call Demo Update!
New Update! Firstly, this is the last big demo update! (aside from any bug fixes). I will be pulling the demo in 2 weeks or so in preparation for the Prologue release! The Prologue will be a free permanent version with a few more features and a bit more content in the way of enemies, bosses, and at least one or two alternate base abilities. The current release timeline for the Prologue is mid December! This patch contains : 7 new runes! -Launched Spell Rune - Create a projectile that casts your spell at the end of its destination -Recast Rune - Hitting with your spell recasts your base spell on that enemy *For both of these runes, subsequent modifier runes apply to the triggered spell. Any Previous runes apply to the spell doing the triggering 🤔 -Global AOE Rune - HUGE % increases to radius of the attached spell and any secondary effects (Spell orb, mines, launched spell, etc) -Bonus Rune Level Rune - Applies the rune level of this rune to the rune underneath this one -Random Rune Level Rune - Each cast, applies the rune level of this rune to a random rune underneath this one -Debuff Lengthen Rune - kind of self explanatory -Spell Power Rune - The rune level of this rune causes you to cast with that much extra Spell Power With so many new runes in the pool, it makes it a bit harder to get the runes you might be wanting, so now the end of room will only ever drop Runes or Relics (no more chests of gold). Gold dropped from slimes has been increased to compensate As an important note, when replacing/upgrading an existing rune, you no longer loose any rune upgrades you had previously made to that rune! Min-Max without losing out on your investment Elemental Heart Rework! Elemental Hearts now use the same system that all other skills use and are scaled with the power of a the slotted rune. All Elemental Hearts will have upgrades limited to the max upgrade slots of the slotted rune. All Elemental Hearts effectiveness is now multiplied by the effectiveness of the slotted r...Read full article on Community Announcements (steven)Patch NotesOfficial
Small Roguelike Celebration Update!
I've pushed a small update to the demo branch in celebration of Roguelike Celebration! This update includes -New loading screens -rebalanced and scaling monster difficulty -Updated visuals for shooter and mortar slimes -Updated slime spawning variation logic -A new enemy! -Updated AI pathing and speed Hope you enjoy and be on the lookout for the new slime! They're deadly! Thanks for playing! StevenRead full article on Community Announcements (steven)AnnouncementsOfficial
Development Updates!
Hey Look! A dev update! I recently finished work on 4 new runes! Projectile on Hit, Projectile on Conclude, Nova on Hit, and Nova on Conclude On Hit runes cause you to cast that spell on an enemy when you hit, and on conclude causes you to cast that spell whenever the casting spell "concludes" After slotting these runes in, any future runes will apply to the triggered spell instead! This gives room for some pretty crazy interactions Shown here is Projectile on Conclude alone, then a Volley Projectiles that all have projectile on conclude, then a single projectile that has a projectile on conclude supported by a Ring of Spells, and then all of them combined! As well as a Fire Dash supported by Projectile on Conclude, then Nova on Conclude, then Ring of Spells! {STEAM_CLAN_IMAGE}/43763858/417d9ac4400e00312ab5b7b1ddee40554540b652.gif {STEAM_CLAN_IMAGE}/43763858/b5eedc53cd3a9f5700615027ada7b2eb583f92e7.gif Along with this update is some balance and scaling updates. Enemies now scale in power with every room! Along with that, enemeis are sorted into categories (ranged, thicc boys, filler slimes) that have a limites on how many of them can spawn in a room, no more rooms filled with 80% mortar slimes! I have some other new runes in the works, and hopefully some new monsters and bosses after that. Once that's wrapped up I'll likely push all of this to the demo branch 👍 thanks for reading!Read full article on Community Announcements (steven)
