Oh man, this would be such a cool game if it wasn't so exploitable. But let me start at the art. I really like the 3D graphics and effects, and the UI transitions, but the UI itself, like the graphic of the UI, is not very nice, and there is not exit button or credits, when you finish the game. However, it's good that you have a tutorial screen, and the sounds are also nice, just as the music.
Now, the puzzles seem to be very good thought through, also in connection to the rewind theme, and could be a lot of fun, if the player plays them right. However, you can skip the solution of every level in it's entirety. Let me give you an example: The player robots can literally walk over gaps, that are one block wide, and therefore also easily cut corners. The blocks that fall down, what you have to avoid, fall down too long, so the player can push them off and still finish the level - or not even push them off, because they can still stand if they are only one pixel on the edge of the floor without falling. If I can give you a tip, I would firstly make the robots as thick as the blocks, so they can't run past each other, and secondly, which is the most important, make everything behave physically more correct, like having blocks fall over an edge if they are to far over it; same goes for the player. Also, the player should have to stand on the goal entirely (if the player is more thick, exactly at the center of it), so nothing can be cheesed anymore. A great example of what I mean is the game "Death Squared".
Other than that, in theory, great game and idea.
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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.