There is a long list of Gamepad friendly games.
Obduction (Explore puzzles makers of Myst)
SkyrimVR
Distance (trackmania like sort of)
Redout. (Racing)
Vector 36 (Racing)
Detached (Space explore might be similar to Sub)
Telefrag (Deathmatch quake arena like)
Vox Machinae (Mech Multiplayer)
WarRobotsVR (Short free demo game)
The Free Content Directory here is likely.
https://community.openmr.ai/t/free-content-directory/9153?u=heliosurge