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Eh it's still doing fine.
People played it for a week or two, completed it, and moved on. That's what games used to be. It's not normal for people to expect every game to be a 40-hour-a-week job that you need to play every day for the next 10 years. That's mobile game gacha brainrot or MMO shit.
Play a game, get your money's worth, and then do something else. Maybe come check it out again in a year with a bunch of new updates.