Zombie Vikings has a unique look that while it should be gruesome to behold, is so over the top in its style that it comes off as amusing. Each level is filled with out-of-proportion enemies, disfigured zombies (typically your own characters) and skewed level art filled with all manner of devilish details, but instead of coming out as a horror piece, it instead has the feel of a cartoon you might see on Adult Swim. This offness becomes very apparent when you consider how it messes with both 2D and 3D perspective. While the levels are side-scrollers, you can move closer to and further away from the screen, and your characters remain 2D sprites that essentially disappear for a split second when you turn around and briefly see them on-edge ... yes, even in cutscenes.
I was particularly amused by the amount of effort that went into this game's audio. Not only are the voices of the different characters amusing to listen to, but the background music is an odd mix that really got my attention. When not actively in combat, the music takes on a light, almost elevator music tone, but as soon as enemies appear, it changes to a much more energetic soundtrack that really gets your heart pumping. While the concept of increasing the music when enemies are around is so well established it's a trope, Zombie Vikings' implementation of that trope really makes for an enjoyable experience.