Great game, definately a top teir for this style of game, and in VR too.
I think I've gotten the first secret and found the second (though not entirely sure how to solve it yet) and really like some of the sizes you can get to with the first secret (though I always like even BIGGER).
I played on a classic Vive and had no issues outside of soft locking if I went to fast in slotting in the glyphs. I also feel a restart from post TF option would be good to cut down on some of the time spent (though the TF itself IS always fun...)
EDIT: I have gotten the 2nd secret and hopefully with out spoiling too much for other potential players, I must ask if there are any more gems past the post sandstorm white gem or any more secrets...