The Tyrant's Machine: Isolation and Helplessness

On a distant planet unknown to the rest of the federation, Commander Rex Lupin finds himself trapped, and the rest of his squad missing. on this world, there is no one but himself, the wild beasts that hunt him, and the corpses of the dead that haunt him. Alone, Rex must find a way to get off this planet, before his loneliness drives him insane. The Tyrant's Machine, Isolation and Helplessness is my idea for a 3d first-person metroidvania, focusing on these two feelings listed.