I can only get to level 5 before inevitably getting filtered. Trying to go back from there transports me to the wrong staircase (it will place you next to staircase on level 4 going down to even lower level).
Loading times can be quite long. Correction, it's probably softlocked on "Returning to Lower Dungeons 2" while trying to go back from higher level.
Loading can be quite weird. After dying I picked Try Again and it started all over in another level, so I loaded from autosave and it teleported me to a different coordinate of that level.
I think I'm starting to understand the game more. Instead of comparing it to Diablo 2 it probably resembles Diablo 1 quite closely (which I never played), and suddenly everything clicks. Because of that mindset a lot about the game feels underwhelming, like loot, skills and movement speed.
In such a dark game it would be nice to see a hub area to lay back and resupply.