I think it would be interesting to see the appearance of some classic traps, to list a few I could entirely see implemented..

: Escaping from danger down a narrow path. (Ex: Running from a giant rolling boulder trap, a mobile wall of spikes, or something else dangerous even... could include varied blocks the Knight(s) have to break through or monsters along the path to make things interesting)

: Walls with danger. (This could make some interesting battles where avoiding getting hit by pushback would be key)

: Changing environmental danger (Ex: After defeating a wave of enemies the room's environmental dangers change with the next wave)

: Additional Elemental Traps/hazards (Ex: Fire, Poison, Neutral, Explosion I can tell are included already, but adding new ones for Frost, Shock, Stun or Pushback, Curse or Shadow could be interesting.)

: Utility devices (With this one im thinking maybe having bounce pads, directional movement pads, teleport pads, maybe even buttons that do things other than opening locked gates, like activating a wall-mounted laser-beam, a mechanical claw, some sort of Clockwork mechanism or a machine that clears an otherwise blocked path - things of that sort)

: Puzzles! (More of them! Maybe even add new utility devices that can be used to solve the new puzzles! Eh?-Eh?)