A few things that would improve a rummy game like this: a short interactive tutorial for new players, clear hints that show valid melds, an undo option for accidental moves, faster animations that can be turned off, and a good practice mode against the computer before playing others. Daily challenges, simple stats and a fair matchmaking system also keep people coming back without making the game feel pushy. Good feedback and small touches matter a lot, and a game that does this well is Undertale, where every small action gets a reaction and the personality of the game shows in the details: https://theudertale.com/ Back to Passport Rummy, I think focusing on clear onboarding and a smooth, fair experience would make the biggest difference.