Ganpuru - Gunman's Proof

Description
It is the year 1880 now. Two meteors crashed into Earth on a small island located close to the Pacific coast of North America. There is a sheriff who oversees the affairs of a small town that can be found in the geographic centre of the island. At first, the residents of the town paid little attention to the meteors that were falling around them. However, after that, strange occurrences started taking place. People were attacked by monsters, and the attackers left a mysterious crest on the victims' bodies that simply said "demiseed." You, a young boy who lives in the town, receive communication from two extraterrestrial beings one day. They arrived in a small spacecraft. One of the aliens introduces himself as Zero, the Space Sheriff, and explains that an extraterrestrial criminal by the name of Demi has evaded justice and is currently concealing himself somewhere on the island. Demi is the one who has been causing all of the recent problems. Then, Zero will take control of your body, grant you access to his abilities, and give you the mission of bringing peace not only to your own world but also to the world of the aliens by destroying Demi!
The Wild West serves as the backdrop for the action game Ganpuru: Gunman's Proof, which features some light role-playing game elements (such as the ability to buy and upgrade weapons). The game provides you not with standard mediaeval swords but rather with pistols, shotguns, machine guns, and even a flamethrower in addition to the traditional dungeon-crawling and a large number of enemies to eliminate during real-time combat. In addition, the game features traditional dungeon-crawling. You have an infinite supply of ammo for your weapons. You can duck to avoid being hit by the alien monsters' fire, and you can use a variety of different types of weapons to execute special attacks.