How far can descend the dangerous cavern armed with only a rifle?
I see what you were going for, I like the idea, like you were thinking, I'd add a flashlight, maybe it can run out of batteries and you have to shoot upgrades, or maybe shoot lanterns on the way down to light them up for a bit, also maybe a bat kill count :) pretty cool keep at it! I'd add all kinds of upgrades to keep it interesting on the long way down.