Thanks for the feedback!! :)
There was a lot of cool ideas I wanted to develop for the game (such as different regions on the map where the enemies have different stats, etc). Perhaps I'll continue developing this game in the future.
Yes that's fair, without the story, the theme wasn't very present in the gameplay (other than being a zombie-like shooter). Given more time, I think I could've improved this part but regardless I'm happy where it ended up.