That was a blast! I'm really impressed by the procedural generation, all dungeons had a good layout and easy to find entrance :) Shooting and killing monsters was really satisfying - although I had to admit, I usually shot the from distance, where they didn't bother to spot and attack me :D
I felt like the experience from the game could be hugely improved by adding more content and differentiating the levels. Like one or two more enemy types, but the harder ones only starts to appear from dungeon 5/10? Maybe an option to buy some better equipment? I know, I know, it's a game jaw, you cannot do everything :D
The one thing that "hurt" me the most of a fact, that after artefact purchase I loose all my coins :( I had like 700 after the first run, bought the first artefact and boom, after entering the dungeon my coins counter stated 0. That prevented me from collecting coins "in advance" for further purchases. Also, the mechanics of deaths as a currency seems to have a little of unused potential, because I ended up entering the dungeon and getting killed as soon as possible to "grind deaths", but I don't know, maybe it's a difficulty issue?
Random thought: maybe you could earn a "Death Point" for every floor you completed in the moment of death? So dying in 2nd floor grants you 2 Death Points, but dying in 12th grants you 12 Death Points. I don't know if that would do the trick, just shooting in the dark ^^
But taking all of that whining aside, I really enjoyed the game and completed it with pleasure! Player mechanics (moving & shooting) felt really smooth and fun to use, visuals and sound were also really solid! Dynamic lightning with shadows really added extra layer of awesomness to the whole mix. Great job! :)