This mechanic and idea is legit, and I love the art style--
Plenty of people (myself included) would be into a full game that had this kind of perspective mechanic that went harder on actually having challenging platforming. Fez was awesome but it was heavy on the puzzles light on the platforming. Maybe do the opposite of that... if you decide to go any further with the idea (which I am in favor of, but I don't know what your creative goals are). Anyway-- Really, really cool.
I did fell through the world several times trying to do the first platforming bit, but I'm sure you're aware of plenty of things like that (my game is buggy as hell).
Also, do you have a twitter?