Hey, I have HTC Vive and I did not have the B/Y buttons, so I wasn't able to use the 'opposite' gun..haha. But I had fun using the gravity gun.
I would have preferred teleportation locomotion, I guess next time you can give the user a choice. Also, the pain white rooms were kind of bright for me, I would have chosen a darker color (it's my preference, so no worries).
Well done:)