Kinda fun.
Not bad, but there are some issues. Mainly in the difficulty department. I found that after the first level I could afford the chainsaw which in turn made combat VERY easy. Not that it really was hard to begin with. Though, I will admit not being able to move while meleeing did cause problems. I do think theres some glitches still.. Like the only time I died I couldn't use the shotgun I had purchased in that level until after I cleared the first wave of enemies. Or when I had my rocket launcher equipped I couldn't gain more ammo for it unless I had another gun equiped. Also, I think more enemies should of had melee attacks at least in the first few stages.
Also, the waves of zombies were kind of small unless you were at the end of a level. While the enemies got stronger, they never really came out in numbers that would be a threat even if I waited around for them. Which is sad since fighting the waves was fun.
Speaking of which, a survival mode or something might be fun. And perhaps add indoor levels or something in the next game. This one was kinda a bit too linear for my tastes. Traveling from the bottom of the screen to the top while waiting to kill all the zombies felt kind of dull. It might be a bit more interesting to have ammo or weapons scattered in the level and require exploration to find while zombies swarm you or something.
Anyways, overall its not too bad.