Well this game was ok, though it could've been so much better.
Difficulty: There really was no challenge whats so ever to this game. It stayed at the same steady pace the entire game which was very easy to navigate with. The lack of change in difficulty made them game very repetitive and made me give up early.
Power-ups: Maybe you could actually make the pills do something else like, increase the speed or give you the ability to shoot blocks. It's things like that that make a game interesting.
Overall: I thought it was a smooth running game with nice looking colors. Though there just wasn't enough. I think you made a good base of a game, but could go so much further with it. I give you 3 stars :)