Doing that will grant you a bow, which is a basicly is only viable range option in game(except throwing stuff, which consumes A LOT OF TIME to get proper amounts) and *edited* pretty good area attack, so you can atack several clones in one time
If you CANNOT beat momo still, try: USING CONTROLLER (the only reason I actually beat a game in mere 6 hours), using spears and knives, beating cowgirl or tanking momo with mushrooms and laser sword.