I like the concept! It took me a few runs to work up the will to kill the shopkeeper, even after I'd already bought the pistol. He's just such a sweetheart!
Movement feels good and the art is easy on the eyes. The core loop feels grindy, though, especially if you want to get all the upgrades. I did, and it took me about 20 minutes to get to the end, with my best run being 43 collected coins. Maybe my route was just really inefficient? I probably could have gotten through it in half the time if I hadn't bought all those upgrades, which feels counterintuitive to me.
Anyway, nice work! If you ever do a Shopkeeper dating sim spin-off, I'll be here for it.