The Achievement for the level 500/1000 on the party seem kinda pointless considering how much those individual upgrades cost. Maybe start the Percent Bonuses there instead of later.
Maybe make a commander/boss upgrade so that when you participate in resources gathering or chopping it goes up a set % like 20/40/60 ect. im only on world 5 though so I have no idea if this comes in later already
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 "The Perfect Tower"){kind=icon}
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 "Idle Farmer"){kind=icon}
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