Another good variant of the space invaders game. Opponents have various shapes. A nice game. You can find it here. The game has to be played on a console with a size of 80×25 (you can set it with fbset).
Compiling the game on a Raspberry Pi
In order to compile the game on a Raspberry Pi, I had to change the Makefile file by adding the -fsigned-char flag like that:
CFLAGS = -fsigned-char -c -O2 -Wall