Honestly I think the sanctum catacombs are way too long after dying especially if your lower leveled there should be a shortcut in the mid point. and toxins are way too tanky for what they are like maybe have them turn power down when you parry them.
and i feel like there's way too many enemies to deal with in a short time where they just pile up on you and the models start to inter lap with each other making it downright impossible to interpret the enemies attacks maybe by having a system where they take "turns" like having two enemies watch in the back and replace one another Or just ultimately spawn less enemies.
which might have players to gain a bad habit of grinder lower enemies for hours maybe
And cosmetics items I feel like should not take up slots in the dungeon chest especially for player progression maybe hide cosmetics in weird spots if you can or make them purchasable.
I hope this helps
I'm honestly hoping to start making games myself.