Heroes is similar to the "Tron" and "Nibbles" games of yore, but includes many graphical improvements and new game features including 12 original soundtracks, 94 levels (in 10 different tilesets), and five gaming modes including Quest (the classical Nibbles), or Kill'em all (squish the lemmings).
Vacuum Magic is a fast-paced action game. The point of the game is using your magical vacuum field to collect food and defend against monsters. Food and certain monsters can also be spat out and used as a projectile against other monsters. Vacuum Magic can be played by up to six players, either cooperatively or against each other.
Critical Mass (Critter) is an SDL/OpenGL space shoot'em up game. 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.