Really interesting concept and I liked the level design. Obviously it's very much lacking polish but this is a great start! It's kind of funny to see the player states along with the scene name "testlevel" in the top left corner lol. Please give my game a try too :)

A cool game indeed, I can see that this is more of a prototype of an idea! at my first run when I went to the parallel world the platforms just disappeared and shifting back and forth didn't help ! But Like The direction you want to take the game! the animation and all need some polish and the main character felt as if it was running on ice and the jumps are not really fluid, I'm sure a bit of polishing and addition of more content will fix it all! Good work! Do check out my game it has similar mechanics (changing dimensions)

Just wow, while thinking world shifting is amazing, you also added a peak for it, well done!