Some suggestions: higher level monsters should drop more money as grinding money is slow as hell since you need a lot of money to buy skill upgrades, increase drop rate of skill upgrades to like maybe 20-30%, make a way to go back to the lab since once you get to the last zone currently you're kinda softlocked there from what I see or add more labs if possible, and there should be a place before the caves where you can get a lantern or something so you can see better in the dark, not really that annoyed by it but it would be a good quality of life change, aside these the game is pretty much like a 8/10, could be better but it's good