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Fiend Heart

Fiend Heart

A difficult short game about monster girls.

Released Dec 12, 2022 Developer RM120 Platforms Windows Difficult2D PlatformerFree to PlayCuteFunny
View on Steam ↗ Free (US · as of 2026-09-28)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-28.

72.4%positive76 reviews
Recommended · 1 found this helpful

“Alright, so, I'm officially a fan of your work. HAHA! Literally after meeting the cyclops doctor I was hit by a fire spamming hell, and all I thought of was Undertale as I died on repeat. Got past it, haven't beat the whole thing yet but it said "a short game" so I have to…”

— a player, Steam review · 1 hrs played
Recommended · 0 found this helpful

“Fun and amusing.”

— a player, Steam review · 1 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-28.

8achievements
35.0%median completion
30.5%rarest: Happy Vampire
63.6% of players 49.6% of players 49.2% of players 45.7% of players 35.0% of players 31.9% of players 30.9% of players 30.5% of players 63.6% 0% most earned rarest
Almost everyone has
63.6%Slime Maid — Meet Lucia the Maid
49.6%Shy Cowgirl — Drink Taura's Milk
49.2%Doctor Cyclops — Meet Iris the Doctor
Rarest badges of honor
30.5%Happy Vampire — Eliza's wish has come True.
30.9%Challenger Demon — Meet Ceres the invader of the castle
31.9%Wanderer Ghost — Meet Ishinagi the Wanderer Ghost

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Nov 22, 2024
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, not only that, but the second map is inspired on Eliza's cast

Feb 13, 2024
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 m

Feb 06, 2024
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

Dec 13, 2023
One year ago, I released Fiend Heart

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

Dec 12, 2022
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

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-28.

GenresAction, Adventure, Indie, Free To Play
Player tagsDifficult · 2D Platformer · Free to Play · Cute · Funny · Singleplayer · Side Scroller · Short · Action · 2D · Anime · Comedy (Steam store community voting)
FeaturesSingle-player · Steam Achievements · Partial Controller Support · Family Sharing
LanguagesEnglish, Spanish - Spain, Japanese
Achievements8
Minimum system requirements (PC)

Minimum: OS *: Windows 7 Memory: 1 GB RAM Storage: 500 MB available space