Thanks for the feedback, this was very helpful! I was able to push an update today which removes keyboard arrows (not sure what their deal is), and fixed the looping music!
The game is definitely intended to be played with keyboard, but for now we're gonna just support the normal WASD until the arrow issue is fixed. I think this is a better way to play anyways, since you will have quick access to undo/redo (Q and E). We also enabled press & hold for keyboard/gamepad to speed things up.
I think the click and drag is a great idea, it will just take a little longer to implement. The game design ideas are wonderful, but we might hold off until the playtest is over before addressing those, thanks again!