I like it, but there could be improvements.
Well, first of all, work a bit on your grammar, it would make the purpose of this game a LOT easier to understand for a newbie who is trying it for the first time. And in case you just CAN'T do that, get someone you know to proof-read it for ya!
Secondly, yes, it get's pretty hard pretty quickly, but hey, that's okay, maybe slow the process a liiiiitle bit, but that doesn't matter THAT much.
Next, the powerups stay the same place on the field when you pick them up, which means that any n00b with half a brain and a bit of talent with a mouse could take the file 2 or 3 times, then pick up the slow down or remove obstacles powerup and keep going in a slow pace for the entire game.
That's pretty much it, other than that, I like the game, maybe you should make the field a bit bigger, so that it would allow players to continue for a longer time, but that's up to you!
5/10 stars, good but not TOO good. Kinda average =/