I got myself into a slight pickle by mashing the Execute & Equip button... -841 gold!
I like the concept of the game a lot! A full game with lots of adventurers seems like it would pretty fun. :)
Sometimes Garvin comes back on his own after a fight or two, other times he'll go until his health depletes, I'm not sure what influences this. He also seems to be immortal!
As it is right now, it takes a really long time to afford the first upgrade. Many trips walking in one door and to the counter, just to be sent out to the dungeon without any improvements. Aside from how grindy this is, the cheapest upgrade of Sharpening and Maintenance doesn't actually change the results; rats always die in a single hit, everything else will still need at least two hits outside of a critical strike. Which means grinding twice as long until the second weakest enemy can be defeated in one hit. This might be bearable if there wasn't so much time waiting to move from the left door to the right.
As I said, though, I do enjoy the idea of the game a lot! If the first upgrade could be bought after one trip to the dungeon, and that upgrade allowed for the next trip to the dungeon to be more profitable, then you'd have an addictive gameloop. (Maybe with less walking, though.)