Imposter: a single-phone party game, free and open source

Our babysitter recently played a fun game with our kids called “Fake It”. It’s a simple party game, not too complex, and doesn’t require any props. The app store is full of them, but they all hide ads or have a €9.99/week (week!) subscription model, all trying to trick you into buying or paying. But it’s such a simple game. Surely, I can just make my own version, right?