Timer seems a little too strict though I'm probably colliding with too many of the enemy objects anyway. Interesting idea. Graphics could be worked on. 3/5
I'm going to say it's a good concept but I feel that some parts might need tweaks. Score bonuses were worth too much, sometimes I felt like there were collision detection issues but my computer was lagging a lot at the time. 3/5
There's not enough to it for this to be worth anything higher than a 1/5. Maybe you could add a mode where you can go up levels by clicking under a certain amount of time?
Could use some work. Haven't come across too many bugs just yet though there is that thing about the power-ups' sprites vanishing though you can collect them by going to the same spot. Keep going with the tweaks and you'll have an alright game.