The start is great we are introduced to an regressed MC looking revenge with the more or less straightforward goals become strongest in order to free the world from the game-like structure.
His trusty aide and dungeon-broker are introduced relatively early and are quite likeable characters that the author uses as stress-relief after the dungeon .But the way the dungeon broker can resolve almost anything is a bit unnatural ,I mean given his connections it's more or less credible for him to acquire stuff ,but it has no sense that he's without information leaks with so many helpers and how he makes the MC goes unnoticed .
The story centers more in the action than the novel and is entertaining enough on that aspect.BUT ,after it advances a bit ,some flaws become more and more apparent :
The author uses that the MC won't get attacked outside as the biggest plot armour ever ,he conveniently states it whenever the MC has a death flag and conveniently combining it with the oposite plot device of once closed people outside cannot target you inside a dungeon .(in the novel it's even messier since the author doesn't get his mind weather they can or can't communicate from the dungeon )
I mean aren't there tracking abilities ? When outside the dungeon he's always out of the public's eye (which is a very bad option since he is constantly pestering the "big players"😉
And lastly the antagonists and side-characters . If a non recurring character or an item are mentioned it's 90% certain the character will be ignored/killed after those events and the item will end up in the MC's hands.