The controls are solid, but you keep a lot of the vertical momentum after you stop pressing the buttons so it can feel a bit unresponsive. I like the fact that you have to stay on the box for some time so it forces the player to actually land instead of just grazing the top of the box. It can be kind of difficult to spot the next green block pulling the camera back or having some UI indicator that points to it would be helpful. Also for now it looks a bit barren adding some textures and more detailed models would make the game look nicer.