Wow, thank you for this detailed and kind feedback!
I can totally see your points. For the next update I will add an indicator for prestige sparks and hide the better passive spawn until the player got their first passive ball.
In your opinion would hiding more of the updates behind some kind of threshold be something that could improve beginning 'easing into' the game phase?
For the blue ball I will think of something to make it more intresting or give it a secondary upgrade path unique to this color.