Launching the game makes SteamVR start, and clicking everywhere on the main menu screen does nothing. None of the apparent buttons worked. Had to alt-f4 out.
Please enjoy this interactive exhibition. But not The Button. · By
Sorry about that - it's a known bug in Unreal. Unfortunately it's not possible for me to patch this game, so I won't be able to fix it.
You could try finding and disabling the SteamVR setting labelled "Start SteamVR when an application starts", or unplugging your HMD.
If you paid for the game, I would 100% understand if you wanted a refund in this case.