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New version with persistent upgrades!
You have to start from the beginning to play with persistent upgrades. Just clear your profile to play from the beginning (Main Menu->Clear Profile->Clear)
For anyone who already has a progress and wants to continue with old mechanic: just continue :)
I've spent a year for development of this game. I hope you will find it satisfactory :)
It is my first flash game (but not first game at all).