Horripilant casts the player as a battered knight who awakens in an abandoned dungeon with no memory of how they arrived. Its underworld is framed as a place of decay and unsettling voices, where a strange sprout becomes the first object the knight is compelled to strike. From that eerie opening, the game sets up a descent through a living nightmare, with bizarre characters and cryptic puzzles among its hazards.
The design combines incremental growth with dungeon crawling, puzzle-solving, and autobattler elements. Players collect materials, fight horrific foes, and improve their gear to push farther into the depths; each step brings greater strength, but the game also warns that every boon carries a burden. Exploration reaches beyond combat into the depths of the player’s camp, while the repeated cycle of adapting, upgrading, and descending gives the crawl its incremental character.
Horripilant is listed as single-player, so its play format centers on an individual journey rather than a shared party or competitive match. Its premise and mechanics point toward a solitary mix of collection, combat, puzzles, and increasingly deep exploration.