The Good:

The core game-play, despite some jank here and there, is solid and original (as comparisons some have mentioned Rainworld, other parkour games like Mirror's Edge come to mind); reaching the summit (or the bottom) really feels rewarding, and you're always in awe at the massive scale of the levels.
It has interesting world-building and a very nice music score. Level design and art direction in some places is a bit abstract and rough, but where it shines it's very immersive.

The Bad:

It's very difficult and at (many, for me) times frustrating, hence not for everybody.
Regarding the store description "Play fast or slow": I felt a bit betrayed because of two points in the game which are timed: in addition to making my already copious amount of cursing worse, they triggered my motion sickness to the max. There are accessibility options to help with it, which I appreciated, but those shifting textures man... in order to complete the last level without passing out I had mute the audio and play lo-res windowed.