I really like this concept - good start! I was hoping this would support VR/Oculus Rift DK2 but it was fun to mess around with regardless. I had some difficulty gauging how far away from the keys my fingers were and as a result ended up frequently swiping the keyboard. It might be helpful to have a depth cue when a finger comes close to a key (such as a dot that gets bigger on the key, or a hairline that connects the finger with the nearby key, or a light on the tip of the finger that reflects off the keys, etc).