I really loved the attention to detail in the animations, it makes the gameplay feel very satisfying. The limited vision also added a lot of tension and really amplified the scares, which I thought was fantastic. Overall, the game is a lot of fun, particularly after unlocking some upgrades.
For some honest feedback, since the game relies on the player dying to give them more upgrades, I think it could be more engaging if the zombies movement felt less predictable. For example, having some enemies respawn in surprising locations would make it more difficult for the player. Right now, it can feel a bit like a “zombie COD” loop (which is maybe what you're going), where enemies are easy to predict, allowing the player to survive for a long time which means it takes a long time before the player actually gets upgrades. Adding unexpected threats could really heighten the suspense and make the gameplay even more thrilling.