Really fun game, it's nice how the levels are made and that you have to really think sometimes and try a few times to make it the right way. Got me hooked since level 1, which is fantastic. I'd say that with a bit of polish this can be a must play game for sure. One detail is that the sound is too loud, maybe lowering the sound around 20% or adding a slider to change the volume could be a nice addition to it.
But then again, very smart game and the level design is well done, nice experience!