@LewdDude It's not really special. The human cast are irrelevant and the manga doesn't spend much time with them. It spends a lot of time on fighting, leveling up, and set piece artwork like the demon castle realm, angels vs monsters war scene, etc. The art direction is great, from complex indoor dungeon spaces to wide landscape shots with lots of detail. But there's no depth to the fighting nor any threat to the protagonist, who never struggles after the introduction arc.
If I had to say the good parts: the best characters are the monsters the MC kills and reanimates/brainwashes, having strong enemies come back as allies is cool and making them stronger is fun. The art is very good. But honestly I have no idea why this is anywhere near 10.