It's a very interesting concept, but i feel like it could have been introduced better, maybe 1-1 movement on the first level. also some of the collisions could have been cleaned up.
love the concept of this game, it starts out really slow and gives you a chance to figure things out before speeding up and really challenging you. It should be made a little more obvious that you can throw the monsters back through the portals.
I like the concept of the game, but it could be more obvious that pressing W or up make you jump in both dimensions. It took me a minute to figure that out.