This looks and sounds fantastic! Unfortunately, I've only got a Vive here, so no individual finger tracking on the controllers. Anyway, nice work, I'll try to remember giving this a shot if I ever get myself an Index.
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Finger tracking is not required. I explicitly avoided using the word "buttons" in game to establish a lore, but it is essentially based on trigger and grip buttons. I didn't have enough time to build a full finger gesture system given this was my first foray into real VR dev. You should be able to play it fine on the Vive. In fact I would love to hear if there are problems.
That did work, but then I couldn't figure out how to make a fist with the Vive controllers. :D Part of the problem is also that the hand skeleton doesn't really match what I'm supposed to do (e.g. when I pulled the trigger, it did accept the first gesture but the hand skeleton actually had all fingers except the thumb folded into a fist).