The levels with glass in them are breaking me. I got past the part where you grapple underneath the glass floor, but then I reached a part with a vertical shaft with a glass block at the bottom. If I could get a little higher, I could climb it, but I can't make any headway from a dead stop at the bottom.
I think I just beat this part, if it's the same part. It's after the 2nd almost impossible form of the tadpole boss, and there are pink latchable blocks that recede in succession so that you have to swing quickly over to the left, then you try fruitlessly to swing yourself off one of the receding blocks to swing up the left side and try and climb up the ice block, but you are always just a few pixels shy of catching the edge. The first time I ever got here I just quit. But this time I figured it out! You have to delay a bit, so that you swing up RIGHT when the block is receding. Literally at the last instant possible. That little extra bit of motion from the block as it recedes and the few extra pixels of lift it gives you then makes the very same swing that was just a few pixels short juuust right. From there you just have to wrestle your nerves so you don't die on one of the copious enemy spawns (it's the little flinger guys and they are everywhere!) but there are no more real trick swings, and if you make it to the door - it's an ending!
This game has definitely
hooked me