Nice game. There's definitely the beginning of something here.
The parallax effect with the background in the level hub feels a bit weird.
In the puzzle levels, the background feels like it's a "wall", like it's physically stuck to the platform bits and you're moving in a small room.
Having the background look exactly the same but behave differently in the hub feels just weird. Also, it makes the doors feels less like doors in the wall and more like magic video game portals. (since they're not anchored in anything)
Otherwise, nice game, good game feel, okay puzzles. Most of them took me two "tries" before I figured out the solution, there was no puzzle where I just blasted through without thinking.