Web site: sourceforge.net/projects/criticalmass/
Platform: Linux, OS X, Windows
License: GNU GPL
First release: 2001
Critical Mass (aka Critter) – a SDL/OpenGL space shoot’em up game similar to Galaxian. The basic idea is simple: you move your ship back and forth at the bottom of the screen, shooting up, while bad guys fly around and shoot at you.
Your world has been infested by an aggressive army of space critters. Overrun and unprepared, your government was unable to defend its precious resources. As a last effort to recapture some of the ‘goodies’, you have been placed into a tiny spacecraft and sent after them.
You can select the most common video resolutions via the in-game config menu. It is possible to run Critter at any resolution by editing the config.txt file. By default the game will reject resolutions that that don’t have an aspect ration of 4/3 e.g. widescreen displays. Non 4/3 resolutions can be enabled in the config menu. The downside is that things may look a little stretched. In the latest version, the game will automatically add all resolutions supported by SDL (OpenGL/fullscreen). To add a new resolution, simply add it to the end of the line containing “set resolutions = 1600×1200,1280×960,1152×864,1024×768,800×600,640×480,512×384”. After saving the file and restarting Critter, the new resolution will be available in the in-game config menu.