Review Detail of CaveSquirrel in Karma Corpse System Omniversal

I think I should do a favor of reviewing this book right now. As I have read, the MC dies of natural causes, not before gaining a system that doesn't immediately make him very overpowered, then fulfill his life to the fullest, until he does of old age unlike many of the Isekai novel/fanfiction MCs where they just die before they even get to die of old age. This is a very unique story, but sadly it is underrated.