i like the core concept, but here are a few things that i didnt like:
-the game seems to be very rng-heavy. even the goblins in the first layer can kill me if i am unlucky enough (dodges and crits). it was impossible for me to get past level 3 or 4 (maybe im just bad tho)
-sometimes levels were generated without traders, enemies or chests. they just consisted of 2 empty rooms (one of which had stairs of course)
-the altars seem really bad. except for the one that heals you (and perhaps the miniboss, which i was not able to beat) they all seem like punishments or equal tradeoffs at best
-trading seemed kinda bugged sometimes. whenever my inventory was empty or one line was full of items, i couldnt drag the items into my inventory to buy then. in this case i had to unequip armor. that way i could "fill" my inventory and allow myself to buy stuff. maybe just implement a way to buy with a double-click or a dedicated "buy" button?
-i didnt understand level-ups. sometimes my xp said something like "45/40", but i still didnt level up. level ups only occured when i used the altar that converted coins into xp. and even when i got 2 level-ups at once, it still seemed like i was weak. the only difference i could see were +5 hp per lvl. nothing else. maybe i missed something tho.
With that being said, i still liked the idea and art in the game. Sadly i couldnt progress far enough to see all of it (almost nothing, even). I'll stay tuned!