I really like the relaxing colors. Clever use of the limitation, although thematically there is something slightly weird about a bird getting stuck behind a house. :)
Indeed, a very difficult game. Is it possible to beat?
I played the game over a dozen times in a row, so I would have liked the ability to skip the introduction. In fact, it is a little confusing because the introduction looks just like the game, except the controls do not respond, so I thought there was something wrong with my browser.