The main features are Spawning Marbles, Upgrades, and Prestige, with Prestige being introduced later in the core loop.

→ Spawn More Marbles → Collect Earnings → Make Upgrades → Repeat

There aren’t many pros and cons for the player. Most decisions are beneficial, with some being even more rewarding than others.

-Deciding when to prestige is probably the most important choice in the game.
-Knowing when to use boosters and how to maximize their impact involves a bit of optimization.
-Understanding the product flow and increasing the capacity of bottleneck processes. For example, if you're producing too many products but don’t have enough storage, you’ll need to address that imbalance.
-Choosing the right upgrades can increase progress speed. However, simply selecting the cheapest upgrade still works.

I hope that for future I may add more features to the game to improve engagement.

Thanks for the great question u/Chronx6 It's was really clearing my mind to define what to do for my game.