Review Detail of Nightmare_Kaushik in Devil Slave (Satan system)

Hey author, absolutely love this novel its storyline is full of suspence the characters are amazing obviously the mc tops it all and still the the update are constant. seriously you did an amazing job this novel is in my top 5 FAV. But its already close to 500 chapters and the MC is so weak I don't mean weak but when thinking about all the other OP characters he is an literal ant he is an still at the lesser demon rank and according to what i know earth is only the starting point there other OP people out there and he is LUCIFERS chosen. why is he progressing so slow sometimes its just frustrating. he is been close to death so many times and everytime someone saves him its just like plot armour. honestly aside from this I have no complaints the story is still amazing its just an opinion please just take it as grain of salt.Again love the novel.