I don't think there are any VR games on F-Droid.
From what I see, there are even barely any games of any kind on F-Droid.
There are hundreds of games on F-Droid; it's just that most of them aren't very good.
Some of the ones that are good include:
(I don't know of even a single VR game though, good or otherwise.)
To add to the list
- Apple flingers
- chess
- Super retro mega wars
- Lato
- These are the ones i can recommend.