A quite innovative idea (and something I kind of tried in the past) - it's been a while since I had any fun with VR!
That said, the music was stuttering for a good chunk of it (to the point of becoming uncomfortable to play). There also some minor z-fighting (more noticeable at the first scene). The buttons worked well, tho.
My device is a Nexus 6 (bought it precisely because I was playing with VR + Leap Motion a few years ago). In fact, my entry is a DOS port of my VR game =)