My calculations show it would take over 5000 diamonds to get the maximum speed boost. That means spending nearly 500 dollars of REAL money. You need to fix this.
I have serious problem with this game. Everything past the title screen is so blurry I can't read any of the dialogue or upgrade desriptions. I tried upgrading everything at least once and that didn't fix anything. Any suggestions?
All cost sharing does is make this game take long than it should. It makes no sense for a level 2 upgrade to cost the same as a level 9 upgrade. And the knowledge upgrade still doesn't work.
It's actually a bit more than that. Cost sharing keeps things in balance. It appears nonstandard because the enemy progression is nonstandard. We have three classes of enemies but for simplicity opted for a single progression path. A level 3 logician for example is not equal to a level 3 humorist. Likewise, a level 3 logic hat is not equal to a level 3 humor hat. So as you progress in enemies, the costs progress with you. But the rewards also move upward. It is a delicate balance and took us months to give a semblance of stability. You can also think of cost sharing if you will as a socialized market of sorts. Prices increase with your income - a hat costs a dollar to a pauper but a vigintillion to a multivigintillionaire! Cheers!
I found a bug. I just finished the 188 Killer Worms quest. The next quest says to defeat 200 Killer Worms, but the quest counter stays at zero even I killed several Killer Worms.
Two suggestions. 1. Besides restoring more HP at each level, repair units should also repair more frequently when upgraded. 2. Add a checkpoint after each boss battle.
 "Crush Crush"){kind=icon}
 "Upgrade Complete 3"){kind=icon}
 "Zombie And Juliet"){kind=icon}
 "Cyber Chaser: Counterthrust"){kind=icon}
 "Ruthless Pandas"){kind=icon}
 "The Power Of Love"){kind=icon}
 "Epic Boss Fighter 2"){kind=icon}
 "Big Dig:Treasure Clickers"){kind=icon}
 "Vault Rush"){kind=icon}
 "Idle Dialectics"){kind=icon}
 "Warriors Battle"){kind=icon}
 "Frantic Sky"){kind=icon}
 "The Exam"){kind=icon}
 "Pixeland"){kind=icon}
 "Abduction: granny's version"){kind=icon}
 "Ziggy's Carol"){kind=icon}
 "Moo RPG"){kind=icon}
 "Evolution Mini"){kind=icon}
Press DOWN if air 20 times.