Here follows a few suggestions with looking into:
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Mercenaries hire : cooldown time should be less, as it makes it extremely hard to finish surge on harder levels.
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Diamond chests : please take out the blue items, most servers have purple items already.
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Stamina: give us more options to buy stamina packs for back up either with diamonds or shop tokens.
4.team Cap: give us more time before raising the cap level.
I hope you consider these suggestions