Screenshots
Watch trailer on Steam ↗Fiend Heart
Content notice: Suggestive clothing and some monster girls have exposed tummies... because I like tummies.
Mostly Positive — 72% positive (76 reviews) · 8 achievements
Last updated 27 Sept 2026
A difficult short game about monster girls.
Free
Action, Adventure, Indie, Free To Play · 2022 · More free games
Delve into the intricate world of Fiend Heart, where quick thinking and strategic planning are key as you navigate through an adventure filled with mysterious monster girls. Experience the thrill of this challenging free-to-play game from RM120.
About this game
Eliza, the agile vampire girl lives alone in her castle, until one night she received unexpected guests and so, the opportunity to interact with other monster girls awaits. Avoid the obstacles and enemies with acrobatics moves as your progress your way through your castle and talk with a monster girl at the end of each level.
This game offers:
- Easy controls let you jump, airdash, slide, backflip, walljump and attack all over the place.
- 7 levels with obstacles, each one more difficult than the previous one
- Enjoy funny interactions with the 7 monster girls at the end of each level.
- Frame by frame drawn animation.
- Sountrack entirely composed by me with love.
- Play as a cute red head vampire.
System Requirements
Will my PC run this? →Minimum
Minimum:
- OS *: Windows 7
- Memory: 1 GB RAM
- Storage: 500 MB available space
Supported Languages
English, Spanish - Spain, Japanese
Latest news
AnnouncementsOfficial
Dungeon Watchers, a game in the same universe that Fiend Heart is out!!
Hello everybody, today I launch my new game Dungeon Watchers on early access here on Steam, and it's featuring Iris as playable character, {STEAM_CLAN_IMAGE}/43168939/059c1ed41ded174ac858e9760c6d80ce23792d6f.png not only that, but the second map is inspired on Eliza's castle from Fiend Heart. {STEAM_CLAN_IMAGE}/43168939/707569475356d2f81616f41df97891450fd4f837.png Go and check out, I'm sure you will like it!!! https://store.steampowered.com/app/2497840/Dungeon_Watchers/ -RM120Read full article on Community Announcements (RM120)Patch NotesOfficial
Fiend Heart 1.1 is now live
Small update which adds small features to the game, here is a list of the changes: Keyboard and Gamepad rebind features added. The aerial movement for the jump of Eliza have changed, player now have more control in air. Back flip have invincible frames, is more useful than before for dodging saw and fireballs . Eliza have a new visual effect when air dashing, wall jumping and sliding. If you find any bug please let me know. Thanks for the patience,Read full article on Community Announcements (RM120)Patch NotesOfficial
The upcoming weekend a small update is coming!!!
Originally I was planning on making a big update with new levels for January, but so many circumstances didn't allow me to fully dedicated to the project, so I have decided to make smaller updates and keep developing Fiend Heart in the long run along side my other projects. The update coming this week will add the ability to rebind controls key and add more control to the aerial movement of Eliza. When I upload the new build I will post the full list of changes in detail. Thank you for reading. -RM120Read full article on Community Announcements (RM120)AnnouncementsOfficial
One year ago, I released Fiend Heart
{STEAM_CLAN_IMAGE}/43168939/dfb31e16fa3bc1363ec46497e8693662d3503c22.png Hello, I am RM120, and I developed this game alone (which is also my first game ever) on my free time after work. Prior to this game I hadn't any experience on coding, neither on sprite animation and neither on composing music. So, the making of this game was a learning experience, and I had fun on all the process from beginning to end, because the game is made with stuff I personally like: monster girls, castles and music with harpsichord. My goal with Fiend Heart was a making a game with things I like just for the fun and learn in the process. In the last year, I keep studying by myself coding and I am better at that now, so there is small update coming to Fiend Heart for January, in which I will add some new features, like the ability to rebind keys of the keyboard and controller, which is a feature some people asked. Another change I gonna make are on the gameplay, for example, Eliza change immediately the direction in a mid air jump without losing speed, this was intentional gameplay design from my part, the idea was that the players use the fixed distance the air dash travel to put themselves on the right place, but the impression I have is that people don't liked that, so I have plans on changing that gameplay aspect. About the difficulty of this game, Fiend Heart it's supposed to be challenging like an old school game at which the player can improve the more he plays it. In fact, is possibly to beat the game without taking damage as I do it myself on this video from 10 months ago: Anyways, I read the reviews and the feedback I received here and on other places, so I gonna make some changes on the levels without dropping the difficulty, but mostly making more clear where the obstacles are on the screen. In other news, I'm working in a new game for the next year, I will have more info about that later but if you wish to see my progress you can check my Twitter. For conclusion, Fiend Heart...Read full article on Community Announcements (RM120)AnnouncementsOfficial
Fiend Heart is now released
Today I release my game Fiend Heart... a silly short game I made with the things I like. I hope you like it. Between today and tomorrow I will upload a tutorial about how make your translation of the game or just edit the dialogues for fun. If you have any comment or question to ask me, go ahead, I will be around here. Cheers.Read full article on Community Announcements (RM120)
