Very good! I like the old-timey feel and there was a nice variety of enemies. But there are a few problems.
1-Flappers are too hard to save. They move at the same speed as the zombies
2-Weapons are too similar and they need a reload mechanism. I found any guns other than the pistol to not be worth it just because they ran out of ammo too fast
3-Upgrades dont really feel like they're doing much. The difference between a level 1 gun and a level 3 gun should be more obvious