Hi.
Yes, the ablities make a kind of progression, and you should master them to progress.
For the forest above spikes, I agree it's not really intuitive : you have to press Up while falling on the tree trunk. I hope you passed it.
Because of some last-minute mistakes, the wall jump isn't very polished. For the jump sound, a file compression issue altered the SFX's quality.
And for music, I'm trying to improve my skills in composing as I usually work in solo.
Thanks for your returns.