okay I finally beat the game, only missing a point thing in the pruple dimension (the place where the egg is, the point thing is behind solid walls in the bottom left of that certain room, with tentacles and shooters in there too).
the skeleton thing was a road block no doubt. still had some short breaks after where I had to go a bit back and forth to rmeember where the enxt step shpould be. but was doable.
obviously platforming sections were harsh but doable after a couple of tries.