Unfortunately, I couldn't play your game - when I launch it, SteamVR brings up a dialog thing saying "Action manifest for UE4Game not found." After I get out of that dialog, I see the room, but none of the controls do anything, and I'm standing in mid-air, above where it looks like the player and the hands would be. I'm using SteamVR 1.14.16, on an HTC Vive, Windows 10 Pro.
If you got a link to a different build, lemme know and I can check it out. It looks like you put a lot of work into the game, and I'd like to be able to play it.