Fop

Fight or Perish (FOP) is a dungeon-crawling game based on Jack Pavelich's Atari
8-bit computer game "Dandy", which was in turn the influence for Atari Games'
arcade game "Gauntlet".

FOP uses concepts from both games, providing one- to four-player action in
dungeons filled with creeping enemies.

Collect and use bombs to wipe out screenfuls of enemies, keys to unlock doors,
and gather food and treasure along the way to stay alive.

Choose from four characters, each with different abilities and weaknesses. (The
one with the strongest weapon also has the weakest health, the fastest one
cannot shoot diagonally, etc.)

Features: 

* Up to four players play cooperatively
* Cellular-automata-based map with potential for 1000s of enemies
* Four characters to choose from, with different abilities and weaknesses
* It's easy to create your own dungeon maps
* Keyboard and joystick support (untested joy support in OS4 version)
* Configure buttons/axis/keys for each player's controls 

--
Regarding OS4 version: 

Compiled for OS4 by Sharakmir. 

Please bear in mind this is an alpha version. I will upload a newer version as
soon as it released.