Cool game! I enjoyed the exploration with some great verticality a lot, there's a strong Etrian Odyssey vibe that I really like. I enjoyed being able to prepare by choosing from a plethora of different items, it really nails the dungeon JRPG vibe. The rewards for combat were a bit light, so it was a bit too grindy to gain enough gold to buy the better stuff, especially because a large part of your loot must be spent for ammunition and healing items.
I think there should be a default weaker attack you can launch when you run out of ammo, since not being able to attack at all is very punitive.
Great work!