I'd like to play this game slightly higher-res. I had a hard time aiming and seeing where I was shooting. Also, the controls seemed to lag at times, but that could also have been my computer/browser (Google Chrome, Arch Linux 64bit, 2.4 GHz i7, 6 GB RAM).
Still, this game is cool. I like the barrel rolls. My highest score in a few play-throughs was 9 heh.