The rebirth (prestige) option appears as an upgrade in the late game (about tree level 15).
As for the general balancing of game, it can be a bit slow in some parts and I am always trying to make it more balanced throughout the game, but being a semi-idle game, it'll include some idle time.
Anyway, thanks for giving it a try and for the feedback. You can follow the development, and give suggestion on X, Instagram or BlueSky (Linked in the description).