Mythion, by author Jason Davis

Mythion is Gavin’s journey through time and space to discover himself, his mission, and how to free humanity from its mental programming. When he comes to in a hospital with no memory of how he got there, he soon finds himself being gently forced into an RPG therapeutic marvel to heal his deepest emotional traumas. The RPG takes place in a quantum generated alternate world, a lush and gorgeous utopia, with its own AI citizens, laws, and culture. As Gavin earns both mental and physical upgrades, he undergoes superhero-like exercises, earning many achievements in the game world and unlocking new abilities in the real world. But he soon realizes something dark is happening in the background when a shadowy military organization begins stalking him.