Cute game, some good puzzle design on show (level 6 was a great example of this). My main feedback would mainly be polish and quality of life. E.g. Starting the level inside the editor menu, with an indication of the robots initial position and movement of direction. Ability to zoom in and out to see the level better (and possibly an indicator of where the end is).
In terms of art, my main feedback would be that it is important to keep pixels sizes the same for all elements to ensure it feels cohesive.
Feedback aside, I enjoyed playing and the overall idea is really solid!