The novel has good premise with dungeons suddenly appearing and MC having supposedly dud skill with hidden potential. MCs backstory is quite interesting. Same goes for some of the heroines but I personally dont quite like revealing all backstories by flashbacks at once and as soon they are introduced. That not only takes away the curiosity to find out more about them instantly but also takes away the chance to reval it themselfs to MC or other heroine in a dialogue.
It is supposedly a harem but MC has no romantic interest so far and the members just keep increasing without any relationship deepening. MC is unfortunately a deef protagonist only hearing whispers if it doesnt concern him. Descriptions about MCs and heroines appearances is also quite lacking or superficial (handsome, breast size, etc.).
World building leaves some open questions, f.e. skill scrolls are traded and farmed by explorers but is never revealed which monster it drops from. MCs party only ever gets scrolls from bonus monsters that spawns due to unique skill. With how many monsters they slay they should have dropped dozens of scrolls but it is never mentioned. The same goes for magic power appraisal and skill appraisal stones that are supposedly "excavated" from dungeons.
All in all there is much that can be improved and I hope to read more in the future, anticipating improvements in MCs relationships and general interactions besides fighting.