lol. This could be a hit. It's always cool to mess around and do those things you're not supposed to.
I don't know why, but I like what I see, gameplay wise. I'm not a fan of pixelated games though. That art style just looks a bit cheap. I'd go for vector myself.
I would however put more.. detail in the game. I know it's a demo and all, but in case you didn't plan to, try to make the world feel more alive, aside from the weirdness that this game brings. You know, really catch that atmosphere of each setting.
Why 'Cardboard' Ground though? I don't get the reference.
Anyway my respect to you for working on it for that long.
Hope it'll be a hit.
P.S. What platform do you intend to release it on.