I think I've posted some of these before, so sorry if you've already seen them, but if not, might be up your alley?

• Rigel Theatre - e.g: https://rigeltheatre.bandcamp.com/album/lengsel-ghosts-of-memories
• Mittsies - e.g: https://mittsies.bandcamp.com/album/helltaker-soundtrack-complete
• Paradise Killer OST: https://kaizengameworks.bandcamp.com/album/paradise-killer-original-soundtrack
• Elliot Hsu - e.g: https://elliothsu.bandcamp.com/album/lost-aria
• Mitsukiyo - e.g: https://mitsukiyo.bandcamp.com/album/--3

A few tracks have vocals, but these ones should be mostly instrumental IIRC.