Definitely keep it simple for the first game. A Smash like was recommended in the other thread. I think that's a fantastic idea. Start with a small roster of two characters and one stage and improve from there.
That's a pretty good beginner project. More characters, more stages, and more gimmiks leaves plenty of room grow, but still something to be proud of early.
Something creative. Not a clone, but something you're genuinely excited about.
What do you want to see/play that you haven't before?
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