Thank you for the detailed feedback i have added some parts to my notes :)
About the perma death i wanted to have it ingame but it is more like a soft perma death because if you have items in the stash you can just create a new team and continue. And selling items is not so good implemented, there is a building bottom middle, where you can click the icon to sell all damaged items or click the dollar sign and then press on items that should be sold.
I love the idea about hidden rooms, it can be a special dungeon where you dont see what is next or something like that.
One question, when you equipped items did you look at the stats or just checked the rarity and then equipped ?