Fun entry and a mechanic! I wouldn't lie if the zombies didn't spook me a little the first time I bumped into one.
I feel there's more to explore with this concept and perhaps some cool way you could involve the flashlight more down the line, perhaps by adding some kind of solar panels you need to charge with your flashlights ( not super realistic, but y'know ), or enemies that react in strange or eerie ways with the light beam, perhaps darting really quickly across the light to signal it's about to attack from behind
Great job though, I enjoyed what you did :)