pretty good
It was a nice little time waster for about 7 min or so. I don't have many other suggestions other than what AutoDingo had. However, I appreciate that you built this from scratch. In fact, I respect that. I'd appreciate an upgrade and...
Make it harder. Once I figured out the mechanics, I beat it on the second try.
Don't give in to the instant gratification so many Newgrounds users want all the time.
Take the time to up the difficulty a bit in a way that doesn't involve more crack-induced enemies.
See you around, space cowboy.