I was really impressed by this. I thought at first it was going to maybe be too simple because the numbered doors revealed the order of operations, but then as you introduced new mechanics it really added to the complexity in a good way. I even got stumped for a bit on level 10 trying to figure out how to get both 2 and 1 back. Having each number have its own special powers is a cool idea and I was looking forward to seeing each new power.
The dimension change mechanic was a little finnicky and I ended up clipping into a wall once, again in level 10, and had to restart. I almost got caught again when I dimension hopped in level 11, but I managed to get out of it somehow by jumping and dropping the number. I'd change the switch number/use power button to something other than right mouse, since during gameplay everything else uses the keyboard and it's not like we need to use the mouse to aim it.
If you wanted to build on this game later, I'd say give it another art pass for polish. The art itself is fine, it's just that some of it seems to be scaled up like the podiums and some of it seems to be scaled down like the robot, so his pixels get smooshed together and his arms disappear when he rotates. The red and green light on the weighted button also seems way thinner than anything else. You can variate line weight of course, but with pixel art it looks a lot cleaner if you establish a minimum pixel size and keep it standard across the entire project to keep it more cohesive looking. Now that you know how big everything is going to be, you can redraw it so the big objects have more detail and the small objects have less detail.
Regardless, this is a complete experience and a very fun game. Even little things like the bouncy black circle used in the level transitions are so polished. This is excellent, congrats!