This is absolutely amazing. I love it!
I've played Super Tux a lot and I've made little game similar to this, but you have done such a wonderful jump here. It really feels just like the original game. I notice you have it labeled as "supertux-classic". Are you going for the feel of the older versions of super tux? I ask because I wouldn't mind helping out a little with this project and maybe add some of the newer features of supertux2 to this game.