Looks nice, but a bit slow

I was looking for a new puzzle game and found this. Wow, a dollar for a good game! Pleasantly surprised at first, but as I got the hang of it I progressed through the levels easily. The odd thing is that the game seems to get easier as you go along. First "joker" (wildcard) balls get introduced, then various exploding balls and so on. It does get harder again eventually, but you have to slog through something like 10 levels to get any challenge again. Overall it moves rather slowly, so this is more of a time-killer than a puzzler.

Anaxamaxan about Swapper -The Rolling Ball Machine, v1.0.3