So much rats proliferation

This game is becoming unplayable. There are way too many rats camping everywhere, especially at the exits. It’s pointless to spend so much time collecting items that don’t drop easily, only for a rat to appear and steal everything while you’re typing the exit. The game just restarted, and I don’t have any money or materials left to surface… and don’t tell me there’s free weapons, because you can’t kill anything with them.