I like the game, but I had two ideas that might make it better. I was thinking, and wouldn't it be cool if you could play as the other "factions" n the game? (Zombies, skeletons, robots) Maybe in this mode you would have different missions to accomplish, instead of running through and shooting everything.
My second suggestion: Can the shop size be increased so that we have ammo for all of the weapons that we got so far? I hate getting a gun I really like( H&K MP5 comes to mind) and then not really being able to use it later on since the ammo is no longer available in shops.
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