Great concept. Very cool implementation. I agree that you should make some checkpoints in your game. The level design is quite clever. Had a lot of fun playing it.One has to wonder though, why Timmy don't just walk to Jimmy's house?
Thanks for your comment, maybe it's not clear but the idea is that Timmy is grounded so is using the other dimension to sneak out to Jimmy's house.
Ah. Forgot about that part.