Relatively good...
It was really fun. Until those fish-like creatures started showing. Wasn't too bad until a certain level where there is one hole in the middle, 2 ramps, and 2 fish jumping constantly near the bottom. Tried many times, got pissed off and left.
The problem here, is that the rest was extremely easy. That problem in difficulty curve just made the game not enjoyable at all when I reached that point. Otherwise, nice game, although the balls sometimes act weird and get stuck where it shouldn't which gets in the way.