Very nice! The light effect was really good. I enjoyed it a lot, it was maybe too easy at the start but it got progressively harder which was nice. Well done!
The only criticism I have is that it seemed like some zombies could attack from a distance, and even through walls or crates (that's how I lost)
The reload mechanic was perfect and really smart, I encountered a bug and the bullet I was supposed to drag teleported to the bottom middle of the screen making the drag distance smaller-> the game easier.
Really nice game, well done!