Almost got it, 12 seconds left ;-) Two suggested improvements:
- Post the game completely when choosing a powerup. Slowing down make for a nice effect, but it feels a bit lame. Unless you want to force quick decisions, then you should leave it like this ;-)
- Hitting the walls feels like a punishment. It could be me, but I find it really difficult to control the player when the direction changes because of bouncing against the wall. Maybe I need a little more practice ;-)