Congratulations for submitting something, I like the gameplay mechanic, it's like a Zombified Snake, where we can build a big army of Zombies and dominate Earth!
I think the musics can be improved on your game, and maybe adding some Sound Effect and feedbacks would be better, but I understand that 5 days is really short when you're doing everything by yourself.
I hope you will continue to participate to Game Jams, that will make you become better and better, I wish you the best for your next games! :)