Damn, that was fast.
More feedback:
1. Make L texture look better by by shifting the arrow origin up and left. Like the turn traffic sign.
2. I am deleting my robots now, when I am trying to remove an arrow from underneath them.
3. If itch and Unity's APIs allow, make full screen, "ask before exiting", and auto-save. itch has popups/buttons on the top right, which obscures the speed controls.