Nice little game! I loved the intro with getting the glasses, was a cool animation.
The way you push boxes in this is very unique to synced puzzle games, since pushing a box costs a move, it allows you to get unsynced with the other half, pretty cool.
This game would probably be nice with a grid layout, since sometimes you need to count out spaces between to align yourself correctly, as well as some walls looked like they had more space to them.
The first level would be nice if it had a checkpoint, since starting from the grey side each time was a bit annoying, especially when first learning the game and controls.
I think this falls a bit into the hole that a lot of similar games face, which is a lot of the times you just put one of the people into a corner so you can just focus on one, and then switch once that one is done, which I found myself doing for nearly every level.
It would also be cool to see more mechanics with the stereo vision, like maybe you can switch between the grey and split vision modes to solve different puzzles. Grey would combine the 2 back into 1 level, but would be limiting since you maybe can't get everywhere without another player.
Art style is very cute, with fitting music. Often found myself moving to the beat.
Well done!