Well, it's published by PS Studios. Specifically, XDEV's Japanese team.
They're the ones in charge of all the externally developed SIE 1st / 2nd party games. Maybe they outsourced the port to somebody else to keep Shift Up focused on developing Stellar Blade 2 instead.
Only played the amount that was in the demo on the full game and its quite fun (my save from the demo wouldn't transfer to the main game but didn't mind)
Graphically looks very nice and runs smoothly. When I do see the butt or jugs having so much physics its kinda funny to me. Imagine that was your job to code and you go home and tell your wife (or pillow) about your day. Hair and cloth physics are quite nice too. Still trying to get used to the fighting the way it locks you into a combo before you can switch enemy.
I got the deluxe edition on cdkeys for £55ish but don't have access to any of the stuff yet. I have like 3 or 4 costumes for linking my PSN account and pre-ordering. The DLC is in my Steam library though. Anyone else got this or have a workaround?
EDIT - Never mind, I didn't realise it was a quest later on to unlock the new costumes.
Honestly, I think Stellar blade is more DMC/Sekiro/Ninja Gaiden-like with souls-like elements. It's much more fast paced and intense than your average souls game I feel.