Well done. You made interesting puzzles out of a very simple mechanic like this. My own game is a bit similar to this.
I did feel like there was a lag in input detection. Are you snapping the roomba? I never got stuck due to being off by one pixel to the wall. If the lag is due to the snapping then it's no problem.
Presentation is also good. The music fits and so do the beep boop sound effects.
Overall, great job! I think you can release this as full fledged casual puzzle game with more polish and levels.