SUPER ULTRA MARIO KITTY!

That seems familiar to a game that I made with smilebasic custom compiler...

You did make it. I thought you can use it as an example platformer.

Yeah, but I haven't seen it for a while and I didn't expected to see it because I removed the key from the cloud. Anyway, you can do whatever you want with that code. Keep in mind that this could have some bugs if it used smilebasic custom compiler(I don't remember if I used that compiler on the example, but be careful)

Ok! Umm... do you know how you can change the background?

I made the map using smiletool. You can create one with that tool, then save it using the option "SCSAVE". Those file can be loaded within the code.