It's a very good game, but the similarities to Patrick's Parabox is too strong for me. In my opinion, your game lives too much in its shadow. With more distinctive gameplay mechanics, I'm sure it could stand on its own!
For a 4-day game jam competition, it's really impressive that you managed to create a game of this scale (I don't know how many levels you managed to create, but I played it for a while and couldn't finish it, even though I must have completed 8 or 9 levels)!
Your game is polished and very nice, just a good music and i think you can have a very great game!