Xeno Fighters R is an in-development shmup fangame inspired by the Raiden Fighters series by Seibu Kaihatsu.

This game features gameplay inspired by shmups made by Seibu Kaihatsu and Psikyo, in which enemies attack with relatively fewer, but faster, projectiles. It is different from bullet hell shmups like most of CAVE's games and Touhou, in which the screen can contain hundreds of bullets that are slow. Seibu-style shmups focus on quick reaction times and awareness of enemy locations, compared to bullet hell shmups, which focus on dodging and weaving through intricate bullet patterns.

The game has four original ships: the Amada Vipros, the Phyxius, the Zaiva, and the Xelcor. It also features guest fighters from other shoot 'em up games by Psikyo, Capcom, Konami, and others.

There are 20 stages to play in the game with four different game modes to select from.

The story of Xeno Fighters R involves BRES, a group of humans subverted by the hostile Keto. BRES and the Keto extraterrestrials attack ATHENA through various periods in Earth's war history, using the wars as cover to their operations to destroy the Earth. The guest fighters do not have any connection to the story.