How the hell am I supposed to reach the warp in the lab? I can't throw my skull into it, because I can't move it horizontally while it's ascending. I guess it's theoretically possible to walljump up to it, but that would be almost impossible.
The walljump is already hard to do, the shaft is barely narrow enough to gain height, and it has overhangs on both sides, and spikes on top of the overhangs. Is there another way?
Apart from that, the platforming is good. The achievements are poorly implemented, though. They aren't kept when I start a new save, and they don't have descriptions, so I have no idea what to aim for.