Fun game at first, and I really like the visual design. But as others have said, the late game gets very tedious. Needs a sell all button (preferably by type) or autosell options, and absolutely needs a comparison to what you currently have equipped when hovering over loot. I also have been having trouble with the save system. Almost everything is retained properly, but the last two times I loaded the game I've been missing all my equipped loot except for a few slots.
There's also a lot of extra space in the Kills tab, maybe there could be a greater variety of enemies (not that you really notice what you're killing anyway).