Such a great game! The pixel art and the music maybe could use a little help but the concept is absolutely awesome. At first the game seemed kinda unfair because i was dying really fast but then i realized that i need to build the horde around the main zombie and maan that's such a fun concept! I also noticed that you can change the position of the zombies by walking into a border, i don't know if that was an intentional mechanic but it sure as hell is a fun one! I would recommend snapping the zombies to some kinda grid and i also think you should make a hp bar for the main zombie.