This is a simple implementation of Space Invaders in VHDL.
A gameplay video can be found here: http://cameraweb.ccuec.unicamp.br/watch_video.php?v=SC66ZN8645GG
To change between screens, press 5 or space.
The keys 4 and 6 move the player ship to the left and right, respectively. To shoot, press 5 or space.