I loved the music, which gives a relaxing vibes. The game has a very basic concept but executes the theme very well. It's like one of the games that I play in the appstore. Although I think you can widen more the concept of the game, include game modes like arcade or challenging mode. It has the potential to expand into many more levels and obstacles.
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I've never thought about obstacles or different levels. But I think that could be really interessting =). Because of the simple controls I also thought that it might be a candidate for the app store. Well - I'm not sure if the port would be worth it. My last games weren't that attractive there and I think it also doesn't help that I stop very early with providing updates (afaik the store-algorythm don't like abandoned apps :-P)