The balance is off. I got through the whole upgrade tree without even prestiging once. Then I found out you can't save up before a prestige to get an advantage, but once it got to needing tens of points to prestige I'd be filling the whole thing up again.
Hey thanks for your feedback, I've re-balanced a lot of things in the game, unfortunately I've changed a lot of the core logic and had to change the save file so their might be a chance that your save will be reset but feel free to try it out again.
The steam playtest is still using an old version at this time.