It was a very nice experience. The visual effects such as the rain and the glow are harmonious and pleasant and create a good atmosphere. What I noticed: In the very first level, I didn't know how to get to the note in the far east until I accidentally found out that it's a bridge you can walk under. I think you'd have to mark it somehow with a path underneath or something, otherwise it's a bit frustrating. And as others have said, it lacks some sort of challenge to overcome.
Otherwise very good job, it was fun :)