Nice game
The people who are impossible to kill are Marx and Einstein. They are just way to fast and powerful. Maly Daly can be killed only when you use the girl. To kill Maly Daly, incur her wrath. Make sure she hits Einstein, just keep running, she will die evuantully. Herr Feud will die with the quest. Mario can be killed buat takes a long time since there are no npcs to protect u from him. Simply stock up on mana pots, buy the glimp trinket and keep spamming and he will die.(do that and you are in for a treat!) If Maly dies you might get her head lol.