Edit: Added the differences between versions below - that is PS5 vs PS Pro vs. PCVR. But first my impressions of the PCVR version:
Great game with melee combat - with sword and shield - and you also have guns. You're visiting an alien world, but my first great impression really was "wow - like Alyx, I can save the game whenever I want!". I'm very tired of games with checkpoints, so really great that we got a proper save game system in Arken Age.
Graphics are awesome-ish. Can't help thinking in some locations that we're getting a game designed for the PSVR2 with sometimes slightly fewer polys and worse textures than the best PCVR games - but then the game greatly impresses in other locations. It's also beautiful to see PSVR2 and PCVR go hand in hand to support each other. Compared to the many horrible low-end Quest ports. Arken Age is by far no Quest port.
After much testing with the RTX 3090 and Index, I ended up using highest graphics settings and Index res 276% in 80 Hz with no motion smoothing - to get solid 80 fps (keep the res scale in-game to 1.0 and set the app specific SteamVR res instead). Basically exactly the same settings as Vertigo 2. Graphics also carry some resemblance to Vertigo 2.
After 12 hours I'll rate the game 8/10. There is a learning curve for the weapons and controls, which can be slightly frustrating at first.
Main problem with the game is the too weak guns. The guns feel incredibly weak. Even after numerous upgrades, my guns are still very weak.
The game also re-uses locations, so you'll have to go back - and forth - many times. You have to remember several locations as the map is close to useless. And because the levels are big, remembering where to find some small rooms to gain access to important items can be very frustrating and a chore.
Killing the same 3-4 different enemies in the game gets old fast.
If you save and quit the game, or just load another level/map, and then go back to the previous level/map, then the level you're loading will be repopulated with enemies - even if you just spent much time cleaning that level for enemies. I'd prefer to have killed enemies stay dead, at least for just 30 minutes...
Index is perfectly supported - well, no finger tracking, but you also only got three fingers including a thumb :-)
If you're in doubt about buying the game, give it a try - you have 2 hours to try it and can refund.
DIFFERENCES BETWEEN VERSIONS:
PS5 vs. PS5 Pro:
"For PlayStation VR2 players with a PS5 Pro, Arken Age offers two choices. Performance Mode is the developer's recommended choice that lets you play at a native 90fps and 3040 × 2240 resolution. Quality Mode uses 60fps gameplay with reprojection and a higher resolution of 4000 × 4096 VitruviusVR also confirmed Arken Age on PS5 Pro has a 15% resolution boost over the base PS5 console in Performance Mode, and a 25% resolution boost in Quality Mode." Source: https://www.uploadvr.com/arken-age-review/
PS5 (Pro) vs. PCVR:
"Main differences is on PC Super-sampling, AA, shadows, and LOD bias is unlocked, but on PSVR2 there is DFR, HDR, adaptive triggers, and headset rumble. Otherwise both builds are exactly the same" - source, reply from the devs: https://www.reddit.com/r/virtualreality/comments/1i2rkpd/comment/m7ni8fa/?context=3
To sum up:
Only with PCVR you can get getting solid 80, 90, 120 or 144 fps in what must be the equivalent or better version than PS5 Pro in 60 fps Quality Mode (with reprojections). Which version will be best, PCVR or PS5 (Pro), will depend on the capabilities of your gameing PC.