Nice concept and all that, but I'm afraid that level 18 has an impossible layout (or it's at least too difficult to be considered fun). Next time you design your levels, make sure they're tricky yet doable.
Really liked the pixel man, get's a bit repetive, would be nice to have bigger visual distinction between universes
I thought it was a very interesting concept, very challenging at times, but overall simple to understand and simple to play. Great job!