I love this game, it's neat!
As a point of critique, the splitter's directionality is not obvious and even if you know about it, it's still a 50/50 trial and error type of thing.
Unlike most commenters, I actually love that you made the choice to support keyboard before mouse. More games should allow you to use the keyboard as much as possible, it is way better for preventing RSI / carpal tunnel health problems. You do probably need to refine the controls a bit more, though. Perhaps merging the movement and rotation of the cursor into just the WASD keys? A single keystroke will align you if you're not aligned, and move you if you are. I think that might be easier and more intuitive than involving Q and E.