Immortal Mantis is a pixel video game developed in the psychological horror genre. The main character of the project is an ordinary person at first glance – the worker Akina. At the beginning of the story, he fulfills his cherished dream by purchasing a beautiful farmhouse and surrounding territory. However, everything turns out to be not as rosy as it seemed at first. While exploring the new home, Akina realizes that its previous residents were hiding terrible secrets. And worst of all, the protagonist has to study the soul and mind of a serial killer known as Mantis. Where all this will lead the poor person depends on the user's decisions.

Immortal Mantis has 2 endings. Which one the player goes to is determined by the information collected. Game locations are equipped with hiding places and secrets that can be explored. Thus, the main character studies in more detail the past of other characters, including the maniac. To enhance the user's immersion in the atmosphere of a dark story, the project is made in a pixel style, and there are no bright colors. Control is carried out from a top view, which allows the gamer to fully view the location. There are also puzzles here. They need to be solved if Akina wants to get to the next piece of the solution to the main mystery. Some puzzles are relatively easy, but the further the gamer advances, the more difficult the riddles will become.