This game was very satisfying, seeing the clean pathways left by the robot. I agree with @NANIkisunami about the pickup sound being to repetitive. One thing that I think would add a little bit more to the game would be adding simple shapes in to fill the room and make it feel more lived it. Other than that, the controls for the robot felt very good as well.
This is a good game, fits the theme well, and is quite satisfying. Well done!