Hi Ross, just rewatched the big birthday video and thought I'd contribute some of the soundtracks which I've enjoyed over the past few years.
1. Viva Piñata - Charming and peaceful orchestral soundtrack. Occasionally available for vinyl purchase at iam8bit.com, but the easiest source to listen to is this YouTube compilation
2. Neon White - This is not a particularly obscure game, but the soundtrack (as well as everything else in the game) goes pretty hard. Split into two albums, Part 1 which is more up-tempo and Part 2 which is somewhat more chilled out
3. Mirror's Edge Catalyst - Another mainstream game, great soundtrack by Solar Fields. Also extremely long (5 hours and 13 minutes). I've linked the song 'Catalyst' from the OST but it's a pretty solid OST all round
4. Octopath Traveler I & II - Nice relaxing music. I have linked to a chill mix for the second game
5. Ratchet and Clank series - This mix contains the top bangers
6. Journey - I'm sure someone already posted this but the whole OST is pretty stunning
7. Kena: Bridge of Spirits - sort of a mix of new age music with action OST