Very nice! I quite like the sprite art (the zombies are honestly kind of adorable), and the panning camera for the menu is neat.
The performance seems to plummet after about the first encounter, though; may be worth checking your process time / memory usage in the Godot editor (debugger > monitors). The game also crashes after a few minutes, and I get a warning from my computer about resource usage that could lead to security vulnerabilities. I’d try to patch that asap if you can, for the benefit of the other reviewers.