A cool relaxing and meditative game, but:
- There's no ultimate goal. If the game's philosophy really is to calmly and relaxedly throw balls and watch them fall, then that's acceptable — but in the future, you could add separate modes that at least have end goals like maximum points, balls, or upgrades
- However, as far as I know, Patinko is a gambling machine — so you could lean into that, making the player want to win back their losses again and again. Create a unified in-game currency system, and each session would cost that currency. Ideally, you could build a small story around this concept
- At this stage of development, the number of upgrades is sufficient, but it would be nice to unlock them gradually and add different types of balls with their own effects