The initial idea of this story is creative. However the author makes some very basic mistakes in that his world is that without much emphasis or development. You can see inspiration from other RPG‘s but he never defines the rules of the game or what exactly is going on. For example do you mean protagonist is all of a sudden trapped in the world but there is no context to what is supposed to be going on in it. At the same time every character the protagonist interacts with is a flat self absorbed asshole. There is no contrast or development of these support characters.
In summary it seems the author was captured by their own idea of what it would be like to play an undead NPC without making them a vampire and that dominated their focus letting everything else fall to the side. This could have been a better story if more emphasis on building the world had come in during the beta reading.