Rather enjoyable game
It was an enjoyable game that wasn't too difficult. It's a really fun little game that feels like a much slower Metal Slug, which makes sense, because you're dealing with zombies and all.
The sound was pretty well done, and fairly atmospheric.
Graphics were ok. I liked the artwork, but the graphics sometimes looked a little bit lazy, such as with the main character having his mouth separated in half like a Canadian from South Park.
Gameplay itself was fun, and not too difficult. The map was sometimes a little big confusing to follow, but generally, it was a fine, fun shooter.
This isn't the best shooter I've ever played, but it managed to entertain me for a quick little bit, which is really what games are supposed to do.
One final hint, however: next time you make a game in English, make sure someone that speaks English as a first language checks it over so that the text makes sense. Some of the graffiti and objectives had quite noticeable errors.