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Games in which the player shoots things to progress, usually with a variety of guns, and other times with bows and arrows.

Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.

An international holiday celebrated on October 31st, some particularly common motifs of Halloween-themed works include costumes, horror, and magic or supernatural beings.

Pretty sure everything is indie on itch.io but just in case you want something extra indie.