New update ruined the game
They rolled out a new update reworking the progression process and it completely made it way more predatory for micro transactions. You used to to able to very comfortably play and progress without spending a dime, but they reduced significantly the amount of gold you're able to get from the shop but kept the upgrade amount the same for everything. Wish they hadn't rolled that update out. Or at least balance the upgrade system relative to the amount of gold purchasable.
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Knight rider this games is very addicting and fun and entertaining
Jack
Upgrade button glitched
If you hold down an upgrade button, it might glitch out and refuse to let you upgrade it even if you have enough gold. It stays like this even when you close out the app and re-open it. Essentially a soft-lock.