>>3867097
The steam page calls it a rpg. It was also put in the rpg game category in steam.

the steam description states:
About This Game
Welcome to UNDERTALE. In this RPG, you control a human who falls underground into the world of monsters. Now you must find your way out... or stay trapped forever.

((Healthy Dog's Warning: Game contains imagery that may be harmful to players with photosensitive epilepsy or similar condition.))