Interesting...
To those who think it needs color there's a reason for that...not to spoil but finish the game before you even think to put down that comment.
Also I liked the way that the obstacles were timed with the music. It made it simple knowing that all I had to do was jump along with the beat and enjoy the visuals. Love the style of the game as well.
This is an "art game" so I can understand if the gameplay isn't really the focus, but I have to agree with others when they say that it could use a bit more. I think that some sort of change should be happening as you progress, and I don't just mean the birds. It's just kinda missing that "umph" that a game should.
Overall it is a pretty decent game though. And no offense, but it was great that you didn't make it TOO long, because it was the perfect length for a game like this.