Sorry dude but I ran in to a problem playing this, the car just kept turning right, I couldn't actually go in a straight line, I dunno what was up. I'm not going to rate your game as I feel it would be unfair on my experience, but I hope others have better luck.
Also to note, when you're building in UE4, make sure you disable the SteamVR plugins, because us VR owners have SteamVR start up when we launch the game otherwise, just a bit annoying (you're not the first and I doubt you'll be the last lol)