From GameBrew - a wiki dedicated to Video Game Homebrew.
Pure is a simple side-scrolling shooter which uses 3D mode for all graphics.There is a secret fire mode which is like a matrix style slow motion where you can shoot a set of bullets and then fire them all off at once.
It was an entry of the NEO summer coding contest 2006.
D-Pad - move
A - shoot
Start - activate secret shooting mode