Zombieville USA 2 is a side-scrolling arcade shooter that expands on the potential of the original Zombieville USA by adding tons of weapons, more unlockable content (including playable characters), and an upgradable skill system that makes for some fun RPG elements.
The gameplay has remained gratifyingly simple: you run from left to right, kill as many zombies as possible in 2.5 minutes (or longer, if you want to push your luck), and smash boxes and other objects for money and ammo. The RPG elements come in as you choose your buildout for each level, picking three weapons and three skills. You start the game with a pistol, shotgun, and baseball bat, but you can buy and pay to upgrade almost 20 weapons in all, everything from a minigun to a chainsaw, and different effects (such as knockback capabilities) make for interesting choices depending on which kinds of zombies you'll be facing in the game's unlockable (and increasingly zombie-infested) levels. A wide variety of upgradable skills offers similarly challenging choices, as you decide whether to focus on certain kinds of weapons, or invest in something like speed or the ability to find more ammo or money.
What makes Zombieville USA 2 so much fun, in addition to its cartoonish gore, is that the complexity of these choices doesn't weigh down the gameplay or the interface at all, and the ability to experiment with--and power up--different skills and weapons encourages quick 2.5-minute sessions as you build up your arsenal and skill base.
We'd love to see even more levels--and skill and weapon choices, too--but Zombieville USA 2 is already a solid game, a worthwhile download for fans of side-scrolling shooters.