I really liked your game!
It's funny that we both had 'almost' the same idea (regarding the mechanics: moving two Characters at the same time (in different dimensions), trying to get to a Goal at the same time - that was my original intent... but in the end for the sake of time (and for not making the game more difficult) my team decided to allow the Main characters go across the Portal / Door even if it is not at the same time)... the difference in mechanics is basically a 2.5D vs 3D: and even that changed the whole game and perspective a lot.
Your game idea is very cool, and the Visual art + the Lighting work perfect together. For me the "Restart Level" menu was a necessity a couple of times... (I found myself bisecting the Levels and distances to be able to solve the puzzle : ) I got my: "You are Breathtaking" at the end.
I had fun, thank you for sharing your game.