@Victor-0, I see that @Albertino-Júnior answered how to open a specific Steam game here.

You have to find the steam game ID, then you can create a command like this to run the game:

"C:\Program Files (x86)\Steam\steam.exe" "steam://rungameid/1531290"

You can find the steam game ID by looking it up on the Steam store, then you'll see the ID in the URL.

https://store.steampowered.com/app/1531290/Nebuli/

BTW, I wrote that Nebuli game with a friend of mine. It's VR only though.