To clarify, the rating would be around 3.5 on a good day, but I do have a few personal issues with this particular story. One problem is the inconsistent language used in the translation or possibly the original source. There are frequent changes in spelling or phrasing for abilities, species, or organizations, which can be confusing. While it doesn't significantly impact the overall reading experience, it occurs rather often, about every other chapter.
Another annoyance is the main character's decision-making; he consistently chooses high-risk targets instead of adopting a long-term, low-risk strategy. However, considering his circumstances, it's somewhat understandable. The final issue I have might be a plot hole - the game they all play has endings based on race, yet it's multiplayer, and there's a generational gap between players who've heard of the MC's legend. It might just be something I overlooked, but it plays a role in the power dynamics.
Despite these concerns, the leveling up of the protagonist's abilities and their downsides is part of the series' appeal, as it follows his transformation into a space monster. So, while it's not perfect, I'd still rate it between 3.0 and 3.5.
The uniqueness of the story lies in the fact that the MC is a genuine monster, not a stereotypical hero. The interactions between him and his companions are enjoyable, especially with their playful antics and the amusing cross-species confusion that arises when they care for each other.