You'll run into over a dozen different kinds of zombies throughout the game, and the one thing they have in common is that they all want a taste of your brain. Some are easy to kill, while others mount more of a challenge, and may even go so far as to set traps for you to fall into.
Luckily, you have the chance to collect a good arsenal of weapons to take down the zombies. The weapons will appear floating around in space, so you'll need to execute some fancy moves to reach them - but it's definitely worth the effort to get your hands on machine guns, shotguns, pistols, and more.
Zombie Portals is an action game that, despite having simple controls, offers up a serious challenge thanks to some difficult levels in the game. Not only that, but it has fun graphics and an appearance by Robocop.