This turned out to be one of the more addicting projectile-style physics games I've played in a while, ran through all 36 levels in a go, aiming for three stars on each one (seems to be a bug on the final medal though, it won't unlock!) and the way there was both fun and rewarding... except for level 33 which really started bugging me after countless attempts. :) That was definately the hardest level.
Anyway, as far as gameplay goes it's just perfect, just the right variation in obstacles and level designs for it to be addicting all the way through the 36 levels without getting tiring to learn. Controls are easy, and I'm glad there's no drag and drop involved but rather just click to play. Very simple and intuitive. The idea is good fun too, nice work!