Memento Mori - A Video Game Concept

A video game concept work i did for the class assignment. The story of the video game takes place in an alternate universe where monsters and humans lived together peacefully for centuries when a war breaks out between them, humanity looses and is banished to a dark realm. Years later after the war, 4 monsters are murdered within a span of few days. Among the fear and uncertainties of the peaceful monster race, rumors began to spread that humans are trying to take back the kingdom.
A detective is assigned on the case to investigate the murders and will be controlled by the player. The detective is special kind of monster, they have a phantom like appearance and can possess any body, whether dead or alive, temporarily and can also turn back time temporarily. If the body is alive, it can be possessed for 3 minutes seconds. The downside is that the player will be stunted for 25 seconds if they use this ability. If the body is dead, it can be possessed for 2 minutes, and time can be turned back exactly 2 minutes before the death of the body. The downside is that the player will have no vision for 20 seconds if they use this ability. Both abilities can be used two times by the player on each murder case. These abilities should be the last resort and player must rely on cyphers scattered on the murder scene to solve the crime first.