I mean I guess it's open to interpretation, like classic could mean something from the past of high quality, or like a classic style Metroidvania like Metroid and Castlevania, and we could try our best to emulate that with our games. IDK, that's just my take on the theme.
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I think that makes sense. I was thinking of making a game where you switch out game cartridges of an old game system and each one of them are different mini metroidvanias, and certain items or abilities will be usable across each of them.
Or each one of them is from a different time period, and if you make a change in one of the oldest games, it will also happen in all the others.