I have never played this game before but all i know is that its new its pretty good and it doesnt have much of anything its just jump in and play so i believe a shop would be a great addition and it be like call of duty in some sort of way with like using xp everytime you kill something and then you unlock things or when you level up you get some money (in game money no kreds) and other game based things for more freedom in the game.
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