This is fantastic! I love the choice of art style and music (extremely peaceful, whimsical and dreamy), and I'm really impressed with the puzzle mechanics and the fact that you managed to create eight puzzle levels all by yourself within ten days.
It took me a little while to figure out that I can switch dimensions by pressing 1 and 2, and then the way the dimensions worked felt a bit mind-bending at first, but then I figured it out - the dimension that each Bro can interact with never changed, regardless of which dimension is currently being displayed on-screen to the player.
Again, it's incredible that you got all those puzzle levels designed and tested on time. Excellent work!