Thanks for your feedback. Yeah, I guess physics is one of weakest spots of the game. Specifically I initially made the game with push only physics, but then decided to add dragging too, but didn't bother polishing, as I was expecting it to be an exit hatch, not the primary way to move things
Regarding ordering, I just reordered some puzzles if I felt they were too similar.
Also those doors in 6A are a bit visually confusing, I probably should have realized that, but anyway. They let you pass, only once the moving bit has moved completely. This was done intentionally to force the player to learn a behavior of swap gun