SteamVR is required for this game. You can run the game even without VR but you won't be able to do anything meaningful in it.
Submission is incomplete and you cannot die, but the general idea is there.
If you want to have a rough idea how it plays out to rate my entry, check out the silent gameplay video.
https://www.youtube.com/watch?v=Nxlcr6oe5BM
In-game audio was mistakenly left at a inaudible volume when submitting.