Guardian's Duty is a 2D cooperative game, where the players need to work together to defeat the enemy ghosts.

The game is wave-based and, in each wave, there are more ghosts spawning on the map. and difficulting your progress. 

The first player, the sorcerer, needs to shoot at the second player, the tetrahedron, shield so that the shot reflects to kill the enemy. This mechanic was the main idea behind the game since the theme from  Retro Jam 2018 was reflection.