A couple ideas to enhance the game –
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Tag-team it! The new waves 'o enemies mechanic has its positives and negatives. (Really, 7+ enemies in a single wave?!) Allow players to form teams of 4-5+ while still keeping a ‘standard’ team of 3 and tap out charactrrs.
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Swap meet. Allow players to swap unused covers with other members of their alliance. Not only would this create more player satisfaction, but it will provide another avenue for interaction between players and build better alliances. All of these factors combine to strengthen and enlarge the player base.