Fantastic game so far, the progression being a bit slow at the start is pretty nice IMO. Only feedback I want to give at the moment is maybe adding the yellow ball as a passive as it is (standard 1x and have it count towards the 'Ready Balls' and 'More Balls' upgrades. So if you can manually spawn in 2 yellow balls maximum, having one automatically spawned in makes it so you can only manually spawn in 1 while both are on screen). I saved up for the first passive upgrade and kinda thought it was broken since nothing happened before unlocking the blue\red balls, and on that note maybe up blue balls to a 1.25x or 1.5x with upgrades similar to red.
Other than that, it would be nice to have a progression bar or some kind of indicator to the next Prestige Spark, I know the first unlocks at $10k but after needing to AFK for a while to cook, coming back to having $120k and a potential 2 Sparks available makes me hesitant to prestige until I hit the 3rd spark but I have no idea if I am close or not.