Not sure if any OST from Ori has been posted, cause it does contain beautiful soundtracks in it.
The OSTs for the Drakengard/Nier series are absolutely amazing, and you can tell that the development team realised how special they were as well with how much emphasis is placed on the music in the actual games. By far one one my favourite songs has to be this boss theme from Drakengard 3 but the entire soundtrack in general is fantastic.
Core Design, known for the good (Tomb Raider), the bad (Wonderdog?), and the underrated (Soul Star).
Composed by Gimmick! composer Masashi Kageyama.
This shit gets me hyped everytime I hear it:
3:20 always gives me goosebumps.