Thanks for the critical feedback, you really wrote a lot :)
1. That's true. I have to blame it on the time limit. I just ripped it out of my other game and did not find the time to make theme matching graphics.
2. I think it might be enough to make the text more visible, make it glow or even blinky. But again, time limit.
3. The Idea to play ergonomically was to use WASD (move) + Q (undo) + R (reset). Probably this should be better highlighted.