Not bad. There is a problem with the wasd controls though. A and D can't get you to the top. W and S can't get you to the right.
You're not the first to mention it. The first thing I tried was relative directions so that either left or right (or up/down) would send you full circle. The problem is when you're making fast decisions and need to nudge left so you press left which then sends you right while on the ceiling. I found it confusing. Unfortunately, the current scheme is also confusing. It's a trade off. If I were to update the game, I'd offer both control schemes, but I'm not sure which would be the default since there are problems with both configurations. The game really needs a dial input instead of a directional input.