The birds kind of disappear into the background making them really hard to see. The sprites for them are really nice though, so it would be great if the background had some more color other than the blue across it so that they could stand out against it better. On level 2 there is a small gap on the floor at the start of the stage that a player can easily fall though immediately after entering the stage from the first level just by the carried over momentum. Not sure if that is intended or not. The platforming in the second level requires precision, or you end up falling all the way back down a lot. there are few enemies to avoid so it's less frustrating but can be a difficult climb.