Dueling Time, Sir!
This game is from the old Ludum Dare platform. You can try viewing the original page on Web Archive
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An enigmatic Victorian inventor has infiltrated a parallel timeline! He seeks to take the place of his alternate self, only to discover-- good heavens!-- that he is not the only one with such murderous ambitions. Facing off in the remotest corner of their mutual victim's palatial estate, the inventors prepare to duel for the right to usurp this timeline for their own mysterious ends!