Nice game!
The art and sound all fit nicely together, and movement felt natural.
Some of the powerups lasted so short I'm not sure I got much use out of them, but the P powerup was fun, shooting bullets like crazy. :)
I do wish it ramped up more quickly. I felt I had played for a very long time without any difficulty. When the lights shut off I was surprised there was still something more to see – and the game might have been more fun and challenging had the lights switched off earlier.