Thank you so much for this detailed breakdown, i have fixed most of the issues you brought up, what i learned is that game testers are very important especially when it comes to creating puzzle games. i have made the robots thick, and fixed most of the loopholes that could be exploited. the only part i haven't really touched is the UI, I honestly don't know what parts of the UI you have issues with. the main menu or the pause menu? or everything?
Nice to hear my tips helped you! In terms of UI: there are a couple smaller things that make the whole picture seem off. I downloaded the game again and wrote down some things I saw:
-in the start screen, the title of the game and "click to start!" as well as the little text in the upperleft corner are blurry, but maybe this is only because of my 4k screen
-in the down right corner, the blue squares overlap with the also kind of blurry hexagons
-the "see tutorial" button is getting scaled from the left down corner, and not centered
-in the tutorial screen, the pictures are stretched, I think?
-if you go back from the level select screen, the robot pops up too late
-(for my taste, in the level select screen, the level buttons are too big, they are over the whole screen, but I don't know, maybe this is just me)
-(I think the blue color of the highlighted buttons is a little too dark and makes them hard to read)
You see, these are all very small issues, but, for me, they make everything seem strange. But as I said, the transitions are superb. Nice touch with that.