Good entry! I like the idea, the sound and music, the hilarious sound effects, and the whistle to the zombies. Your enemy and friendly AI worked great. It is cool when they demolish all the humans and their homes. Cool cowboy enemys and pacifist npcs.
I would have loved to have a minimap, or a pointer to my next body part. because in the end I ran around a lot to finally find the last piece.
Very good thumbnail, which got me here, because it looked engaging
Well done especially if it is one of your first jams!