The Idea is quite cool and you can easily "expand" that concept if wanted!
As for level Design: I felt quite claustrophobic in a few levels, because sometimes the level was moved to one side and could've rather moved more towards the middle of the screen.. or you had quite a limiting way of moving there wasn't much leeway.
I would've loved textures and sound with it. With that, I think it would give off a greatly varied feeling!
Well done, keep it up!