Horde Slayer is a magical fantasy horde survival game with rougelike elements to it. The player is a wizard that got lost in a complex cavern filled with dangerous snakes that get progressively stronger and faster as the game progresses. One of the game main elements is the exploration of the cavern, that is procedural generated and changes every game. The player must explore the rooms on the cavern in search of spells that help him fight the snakes. The player must be constantly aware of the surroundings to not get trapped.