Despite your comments below, the enemies still took quite some time to spawn (I was also moving constantly while waiting for them if that can help you fixing this). I like the presence of several different guns and the sounds were nice, but the controls felt a bit stiff.
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Thanks for playing! The game features a day/night cycle so it could be you was waiting in the day for a while. In the top right corner of the screen there’s a clock which shows what the time of day is by showing a day and night picture and whichever is pointed to by the small line is what the time is. If that’s not the cause of the slow zombies I can try to have a look tomorrow at the code to see what’s happening.