Cool game! One technical issue I had: the embedded player on the itch.io page cuts off the edges of the game, so I had to fullscreen it in order to see the timer. There might be a setting you need to change in itch, if not you could put a message to remind people to fullscreen.

The background audio is awesome. Very creepy. You might be able to cross fade the end onto the beginning so it doesn't fade out when it loops, although that's a minor gripe. The gameplay was engaging, and it definitely had the feeling of being slowly overwhelmed by a horde of zombies. The graphics were functional (I like the font choice) but I think you could do a lot more with the art if you wanted to. Some shadows or other lighting effects would be neat, as would more variation in the zombies. I wasn't really sure what the spike ball things were.

I beat the game on my first try, so perhaps it could be a touch harder. Keep it up!