Very unique idea, I like it. Great music, too! :)
I noticed some bugs, though:
- At one point, the triangles all went into the right corner at the top and stopped moving.
- Whenever I attempt to shoot after picking up an ammo pack, the game freezes for a few seconds, then it crashes. It doesn't matter whether I shoot at an enemy or anywhere else.
I tried the 64 and 32 bit Windows builds on Windows 7. The crash bug happens in both versions.