Didn't know of that term but Returnal was next on my list and that's put me off now
Returnal is amazing. Not trying it at least would be a mistake, regardless of how you feel about soulslike/roguelite. And I'm saying that as someone who loves Soulslike but isn't too keen on roguelike/lite games. It's one of those rare PS5 exclusives (well, former exclusives) that are actually unique and gameplay-focused, along with Demon's Souls, instead of the usual cinematic adventures where you don't even get to fully control your character or be allowed to fall of ledge. Like GoW
I liked it but the hack'n'slash trilogy were absolutely better games with puzzles that weren't a total insult to one's intelligence and deeper mechanics.
I treated every run in Returnal as its own thing, gearing up and trying to play my best, when it clicks it's an absolute mad adrenaline rush.
The audio and atmosphere are stellar.
As for Valhalla, haven't played it yet and in no rush since I think Ragnarok is also overrated AF when it comes to writing and level design. Maybe some day. It'll do for a free DLC though.
Anyways, Returnal is cheap and is on Extra, won't hurt to try it even if you end up shelving it.