First is with the second isekai that happens. You'll know when you get there so I'll spare details, but the sudden change to another world was unexpected. While not bad, in my opinion its kinda iffy. Mainly because the story only just spent like a little over 90 chapters on earth before the MC is suddenly thrown into a new world. I would have liked it if the story spent more time on earth before moving on to another world, and so far its already been like 200-300 chapters already and the MC is still in this other world. And with the way things seems, it doesn't look like MC is getting back to earth anytime soon unless author does a sudden change.

Next is with the fight scenes. I feel that things kinda just get confusing later on in the story when the MC and enemies start destroying a multitude of mountains and large lands during their battles. This ends up making the sense of scale a bit hard to understand, especially when MC gains the power to control space, things just become even more confusing.