Some people say they want an upgrade menu, but I like the fact that this doesn't have one. It stops levels being almost impossible until you get certain upgrades, and stops you from being able to just farm early levels to get every upgrade and not even require strategy.
My only concern with this game is that there's no way to alter the quality, meaning that the sheer amount of bullets can take a serious toll on any computer that has lesser graphics.
@Mystic02 The direct selling of cards cannot happen as, as has been previously stated, it is far to easily exploited. In my opinion, the only possible variation of this would be some sort of auction house. Although that would then simply allow the paying players to further outpace free players as they would be able to bid far higher.
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