You can always change the sprites and then upload the key.
I don't know how you'll do the mechanics to make loops or handle collision with high speed but I hope you could implement those features.
@Joshua:Sorry but no. It's nowhere close to done and is buggy, and, as I said, it's against SmileBoom's publishing rules unless I change the sprites.
@raimondz If I decide to finish it, I might look into changing the sprites to upload it. But yeah, it's definitely a WIP and doesn't have loops at the moment. But I already coded most physics stuff.