Calling this a Multiplayer game is a terrible technicality. There is no player interaction at all. You can add a friend and ave a bot join and attack what you attack but that's it. Sure you can chat in game but there is no trading or partying system of any kind. This game being called multiplayer is sad.
Might be just me but I feel like more things should be available with shells such as higher upgrades, I don't like that you have to get to a certain level to unlock things. Because the most fundamental part of games like this is going back and beating levels over and over again to earn enough to move forward and by doing this you make the game longer and you get better and better.
Good start to a game, maybe implement a turn or amount of times you can be wrong. Because really at this point you just click down on every word tell you find something.
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When playing non-paradox mode. Paradox mode raises the level cap considerably after completing the campaign.