I have too many to post so I will post something recently, 2015 Ori and the Blind Forest had some amazing levels that were hard as F$#@ and some of the best modern day gaming music.
Off the top of my head, is the Ginso Tree Escape linked below.
https://www.youtube.com/watch?v=oX_3KQIsiR0
Cant wait for Ori and the Will of the Wisp.