Good job but i think there is little things to fix to improve player experience!
- Controls are really weird! down to fire is really unexpected and hard to master because we never had to use it to fire :p
- Experience is too linear, I would have appreciate if there was more and more zombies, going faster and faster! Instead the smaller plateforms are a challenge without fun ( i think! really subjectiv!)
Well overall good job, hope you continue it =)