This game was fun but didn't offer much of a challenge. Almost all of the levels I was able to beat on my first try AND get 3 stars. That just ain't right. If you make another game like this I suggest you balance the difficulty a little bit. Price power ups way higher so that players use them sparingly, make it so later levels take a bit of thinking or trial-and-error to complete and the final 2-3 levels should be difficult enough that you have to have all of your powerups maxed!
Just my 2 cents. Once again though, it was fun :)