A little bit beyond what I ever expect, but I wouldn’t mind an “explore” mode for dungeon where it has monsters you can kill but no overall objective.

That is to say, you start the Dungeon with all checkpoints/doors/switches open as if the dungeon was cleared...except mobs are present. Also a shortcut from each boss room back to the entrance. Also Also, some kind of switch that respawns bosses.

So, you could just go to the final boss.