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I mean at this point it is in fact a term, people are familiar and understand. Whatever else they could call it will take some time to catch on. I think that's how language works, words are just the names with put to the things we know and it later becomes an habit because of repetition, hence why people hate when anything changes either logo or name.
With that said, the genre seems like at one point was a dungeon crawler in 2D. You explore a labyrinth-like environment with few open areas. Power ups are another form of keys to progress and it's mainly about familiarizing with the route to become more efficient as you get more powerful.
EDIT: Maybe dungeon sidescroller could be a good name for it? (Has that been taken?)