What i would like to see, is that we need to do more then just kill a specific amount monsters in order to unlock the next floor. Add some extra variations of it, like:

- Add "switches" to the floor, which you need to activate (in a certain order) before the gate unlocks.
- Find x amount of items spread out on the floor.
- Make a specific monster type the target for the current floor. For instance, use about 10 different types of enemies and only 2 of 1 specific type you need to find and kill.
- Kill a specific enemy (an Alpha / Leader of the pack)
- Add a mini boss which will drop special "loot sacks" you can turn in after completing the current set of 10 floors.
- Make floors a maze, where you need to traverse through portals or pull switches / find a key to open doors in order to reach the gate.
- Add an escort NPC you would have to guide to the exit, maybe even rescue.

These are just examples for stuff they can add to the randomization of each floor. Inspiration for these added floor mechanics, came from other content like the "Nyzul Isle Investigation" from FFXI and the Castrum from the Bozjan Front.