Responses
Once again it feels like a poor rip-off from Solo Leveling. At least in Solo leveling we saw him -really- struggle in the beginning, and slowly become stronger and have an easier time with fights. This guy immediately goes from "I can't really beat anything solo" to "let's fight 100 earth elementals on steroids, immediately followed by 100 ice elementals on steroids!" and he doesn't look like he's struggling all that much apart from getting tired...
He doesn’t know or understand his level up ability right? But he welcomed all those monsters and beat them up without a hint of hesitation (the “is it possible with my ability” kind of thing). For someone who’s weak (and he knows it himself), he suddenly became too OP without proper explanation.