Ola, saw your post on reddit, figured id leave a comment. The puzzels themselves are challenging enough, I like the way you mix it up each level with new kinks and challenges.
My main issue with the game is the lag. I don't have the best pc in the world, but it should have been able to play this without issue. My entire playthrough was mired by an extremely low frame rate.
I like your use of the voice over at the beginning of each level. It's a smart way to teach the player about the new level element, and adds a bit of personality to the game. The rest of the game could also use some theming, right now the backgrounds are a bit bland. Neat game, congrats.
p.s. if your using godot it's really easy to make a web build, i'd recommend making one