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DEMON SIEGE

A retro-inspired FPS Bullet Heaven, where every power up stacks infinitely. Become an unstoppable demon-slaying powerhouse with insane speed, massive jumps, upgraded weapons, life leach, and other insane game-breaking build combinations. Become a GOD. Has a Story Mode and much loved Endless Mode!

Steam Page
Developer
GROOVY GORY GAMES
Publisher
GROOVY GORY GAMES
Release
July 6, 2026
27 days ago
Steam Reviews
8 user reviews8 reviews100.0%

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About the Game

DEMON SIEGE is a compact, retro-inspired FPS Bullet Heaven built by a solo developer using the limited but intentionally old-school EasyFPSeditor engine.

This isn't a massive 4-hour campaign. Instead, it's a fast experience inspired by classic boomer shooters, arcade score chasing, and modern bullet heaven games. You get a short and sweet story mode here, as well as much loved Endless Mode where you can play until you break the game with how powerful you get.

Fight through demonic hordes, earn gold, buy upgrades from vending machines, and create absurd builds where every upgrade stacks infinitely. Become impossibly fast until your boots catch the terrain on fire, leap across the map, fire walls of bullets per shot, and see just how far you can push the game's systems.

The engine was originally designed for much simpler Wolfenstein 3D-style games, so DEMON SIEGE embraces that retro DNA while stretching the technology far beyond its intended limits. Rather than chase modern graphics, the focus has always been on satisfying combat, addictive progression, and overpowered builds in a retro engine.

Features

  • Fast-paced retro FPS combat

  • Story mode and the incredibly badass "Endless" mode.

  • You are given a choice of 6 randomly selected infinitely stacking upgrades every 10 kills!

  • Killstreak announcer with bonus gold rewards on high scores!

  • Vending machine lets you purchase ammo, skills, health, and guns every round.

If you're looking for a polished AAA shooter with huge levels and cinematic storytelling, this isn't that game.

If you love old-school FPS games, little fun wild and crazy indie experimentation, and watching your character become a ridiculously overpowered GOD, DEMON SIEGE was made for you. The levels obviously eventually end in story mode and your power stops at a certain point, but in endless mode it doesn't- and theirs no stopping how powerful you can get. The end I guess is when the game breaks from your stats becoming too god-like.. Story mode is good for getting adjusted to the game, can be beaten in 40 minutes to an hour. And endless mode, can be played forever. We highly suggest starting with story mode, and then moving up to Endless mode when you got the sack for it.
Please leave a review, we worked really hard on this game. Thank you for your interest.
Join the community on our discord, wish list, or better yet BUY Demon Siege today!

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