I recall David Gallant did something like this a while ago. A gimmick like this is not really something you're going to find pre-programmed in the UI, but I think you could easily rig up a graphic (or etc.) in addition to a price raise.
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I'm a total novice to game development and looking into how to create my next project. It would basically be a game with mixed 2D exploration sequences and Visual Novel sequences where there's two character portraits and dialogue options. I know the 2D exploration is totally doable, but I'm unsure how to approach a Visual Novel in Superpowers. What would put me on the right track? Sorry if this is a basic question.