I say it was satisfactory.
A few of the reviews have good points, though rare they may be. A radar would benice. Music would be a great addition. It needs no plot... It just feeds the zombie-killing lust, and that's good enough.
My suggestions:
A bigger view of the land would help due to the fact that explosions are usually cut off or go too far. Also the zombies don't seem to be attacking anything; just standing on a road. If I was able to make this game, I would add a few civilians getting mauled to add to the intensity. The scoreboard is impossible to reach due to spammed scores by the same person. One more thing, what's up with the lag? The game doesn't seem too advanced.
Other than those, the game was good. I enjoyed it... Not much excitement or variety. Please do not think I am trying to leave a bad review, I know this is a fair score after evaluating all of these facts. Can't wait until your next submission, El-Presidente and/or reality-monkey!