Despite being simple graphics, I really recommend playing Horizon Vanguard if you like 90's arcade games (house of the dead, time crisis etc) and/or bullet-hell games.

https://store.steampowered.com/app/598740/HORIZON_VANGUARD/

No one plays it, at all, and its a real shame. It's not top material, but its better than a majority of VR experiences. It's really fun and difficult, and feels great to play