So far (Chapter 8), the story has piqued my interest, but I must admit that there are some similarities with other novels. It seems to blend elements from 'Reincarnator,' 'Second Life Ranker,' and 'Omniscient's Reader Viewpoint.' The parallels are quite evident – if you've read any of those, you'd likely notice them too. Despite this, I'll give it a chance since it's new and still in its early stages.
In 'Reincarnator,' the setup mirrors the beginning: a group of survivors fighting a formidable enemy possesses an artifact that allows time travel. They choose to send the protagonist back in time because he was the last to enter the tower and eventually becomes one of its strongest members.
'Second Life Ranker' shares the tower setting with this novel, but the main difference lies in how characters enter – involuntarily – and accumulate points (tower currency) through combat, dungeon raids, and achievements.
Lastly, there's a resemblance to 'Omniscient's Reader Viewpoint' with the presence of a character like Dokkaebi (referred to as Lackey here) and deities from Olympus, devas, etc. These gods sponsor individuals, and points can be used to acquire skills. Additionally, the powerful foes mentioned also align with outer gods from Lovecraft's mythology.
In summary, while the story may have borrowed from these existing works, I'm hopeful that the unique aspects and fresh take will make it worth exploring despite the recognizable elements.