So far this game reminds me of the Mario & Luigi games - not for the mechanics, which are pretty standard RPG fare, but for the characters, humor, and art style. The game's art feels playful in the way the M&L games were. Also, AFAIK, there's no random encounters? (which may or may not have been an issue/present in the M&L games, but I think they weren't)
It's pretty neat - the detective mechanic is more compelling than you'd think and it was fun to teleport around (to previously determined locations) in order to find clues and such. I think the game also does a pretty good job of the fact that you're immersed in first person, there's a few (Joker) sequences that are unsettling mostly because...well, it's you (mirrors, you look at yourself in them).
I also enjoyed going back multiple times to find hidden things and unlock figures and what not. The only issue I had was that there were a few things that made no sense on my first play through BECAUSE they were things to find/pay attention to later. This sometimes confused me the first time I played but it made more sense once I was done. In fact, for a while I was under the impression that there was a different ending you could unlock by finding stuff in other playthroughs and such. Alas, AFAIK, that's not really the case - so the extra draw for re-playing some parts was significantly diminished.
I decided to stop cold turkey because the general "grind" was getting a bit tiresome and I was also starting to hit a wall with grinding out new cards and such. Rather than get curious and boot it up again I deleted the app entirely.
Played and finished and it's surprisingly good - though the connection to Until Dawn is weak at best. I had to take breaks every few sections or so because I would start to get dizzy, but other than that:
Fun stuff to shoot at, lots of interesting things to look at, and some pretty epic set-pieces where you feel small and helpless. I think there was a story to many of the levels, but I didn't really get it or understand it. As far as scary VR experiences go, I'm pretty ok with this one.