Review Detail of GuzaSan in Me! Zombie! Summoned to Another World!

Read till Ch.15 and it seems good so far although I might not continue. Translation quality is good. The prompt is MC was summoned by a necromancer in a fantasy setting from a post-apocalyptic world as a zombie. After he eats the necromancer's brain he takes over his memories and starts going on the path of necromancy himself to eventually become something as close to a human as possible. He does that by cultivating with the technique he got from some inheritance the necromancer had but the entire cultivation premise is a bit too shallow in my opinion. He meditates and depending on the quality and quantity of his undead subordinates his meditation speed varies and he progresses till he managed to reach "basic necromancer" and he absorbs "death particles" and stuff like that that are very niche and from my limited experience every time authors try to reinvent the wheel here it doesn't end up well. That's pretty much it. His main goals atm are being as close as possible to a human being and getting stronger. Seems nice but I guess not really what I'm looking for right now...