Really fun one, and tough for sure, I got properly stuck a few times :)
One thing that might be worth a look, the checkpoint seems tied to the room you’re standing in rather than the furthest room you got to. I wandered back into an earlier room, died there by accident, and it restarted me at that earlier room instead of where I’d worked my way up to. Losing ground I’d already cleared felt worse than the deaths themselves.
Music and visuals are on point, and it’s a great take on the theme, though I might be biased as another vampire game maker :)
Was the backtracking something you wanted players able to do, or did the rooms just end up open in both directions?