Made in just two hours, here's my entry. It even has yellow haired ninjas!
Either way, I had so much more planned for it. I was hoping to get in:
-Lasers that used realtime line drawing
-Other weapons that aren't lasers
-Better everything (I threw the actual game together really quickly; the engine took most of my time)
EDIT: Actually, I lied, it took 3 hours; I thought it was 10 PM, not 11!