Some suggestions/bugs:
Customizable emotes for the d-pad would be nice. Something where you can choose which sayings you want to bind to the 4 directions. AND/OR do a circular menu with the other stick on the controller. The 4 on the d-pad could be quick emotes players can choose.
Action Feed: A separate chat box in the top right that shows kills, deaths, and maybe potions/scroll uses.
Don't let downed players thrown into the ladder activate the timer. Also increase the timer maybe?
You loose your money when changing floors.
The level changing scene is too short imo. It should last long enough to show the last person leaving.
Smaller healing items should disappear for only the person who "ate" them. AKA even if you pick up a small healing item it goes away for you but others will still be able to pick it up. Just to help players last a bit longer. Big healing items should still be one use for only one player though.
Life bars below names would be nice. Have them disappear/go transparent when you get close other players.
Option to always have the camera locked onto your character would be cool.