Well, my mouse kept locking up. The game didn't lag at all though and I could keep moving, just the cursor would fuck up. Anyway, the first level is really long, and unfun, because its the same enemy's over and over again. I didn't even get to mission two. 2/5
600 is a looonnng time. It's pretty boring too. The rocks need some collision detection as well. Stacking gets annoying when theres one big one and two small ones coming straight at you and you have to get all three of those and the others coming at you. Got the badge though.