Pro's:
-lovely art
-gameplay which you can affect by playing smart
-encourages wokring together with other players(tho not largely so)
cons:
-Grindy(tho less because of the auto button)
-energy/stamina system
-microtransactions
i've found that the relays range just isn't enough to actually make it worth using. Anything you'd do with relays are just as easily done with collectors. The relays should get a little upgrded if possible
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