I think having an online leaderboard is the best feature you have. It brings competitiveness to the game. Well thought!
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Exactly! From the beginning, I wanted to make an arcade game with a leaderboard.
After finishing the game, I shared it with some of my friends, and two of them started competing for higher scores. Whenever one of them got the top score, the other one immediately wanted to beat it.
It turned into a terrifying cycle of unhealthy competition, lol.