Your game is beautiful and has enormous potential... But it took me a long time to understand the controls, and when I finally did, it felt like I hadn't understood them before.
Maybe if the cloud collisions were bigger, and there was some indicator showing if I'm going to miss and go straight past, or if I'm going to hit and stay alive, it would help. Aside from that, it's a GREAT game, and I'm even envious of your graphics.
Good Job :)