The game is pretty cool and definitely not to easy. I played it through, died 103 times and it took me 33 minutes. The quality of the game is good: nice visuals, fitting sound/music and no bugs found.
Difficulty: Has a good progression. But for being the first level, it is pretty hard at the end. :)
Controls: Are totally OK. But maybe just use two keys for warking on planets: right -> clockwise, left -> counter-clockwise
Graphics: It looks good and consistent. The character has nice animations but looks kind of weird ... a bit more like a fly than a bird :)
Gameplay: Two thumbs up! Very simple rules and very simple controls are creating an engaging mix of puzzle and action/dexterity.