Cute but buggy
I found the game had some serious bugs, at least when I hit the reverse (or maybe it was gravity change) power up. The background flowed away and I was stuck in a magical world where pipes appear at the top of the screen and stay there (see image: img809. imageshack.us/img809/5214/weirdpipes.
I sort of fixed it by grabbing another reverse/gravity power up, but afterwards my score had overflowed and became negative (image: img607 .imageshack.us/img607/2905/integerove rflow.png )
(remove the spaces in the links to use them)