Great Levels! For the third level I like how there are two different ways to get the blue key. Also I noticed if the Koala moves off the Layout it's gameover. It would be wise to add the bound to layout behavior. I also noticed on the third level that the platform is a little high before you get the blue key I'd recommend lowering it a bit so it's easier to jump across, if you decide not to though. For the first tutorial level I think it would be good to talk about jump key pressing and that depending on how fast you press or hold the key down it will help you understand how high you jump.