The basic gameplay is really interesting and the artstyle works really well, but I think one glaring flaw for me was gravity. That might sound a bit weird but I think that removing gravity (or at least reducing it) would give you much more control so you can focus on the main gameplay, especially with such a harsh penalty for hitting the walls (though I would keep this). Also, the font was a bit blurry - might just be me but it made it quite hard to read.