This game is indeed a top-down shooter, or a top-down shooter that is part of the demon slayer games. It is a monster hunter top-down shooter that has horde assault mode from the start and takes place in a tiny world outbreak.
Defeat every zombie, the horde attack, and the horde defense all by yourself, like a lone wolf. Destroy their own vampire and mummy games, as well as the creatures who stand in your path.
Monster hunter, be careful. Zombies and monsters are everywhere, so you have to kill each and every one of them.