I like the cutscenes that play when you interact with the statue, enter the dungeon, and defeat the dungeon boss. The premise is interesting and I do like the way enemies look during battle. The retry battle option is great especially for tougher enemies so at least I can try to retry the fight or run away which helps prevent me from being sent back to my last save. The NPC quests and NPCs that give items/spells good additions. They are useful and give some insight to the world. I also like weird hidden things like the heal slime with the different icon.
The maze seems pretty extensive for a first dungeon which made it a bit difficult to navigate. The repeating layouts made it really confusing. On the plus side this helps with leveling up and there's a a lot to discover, but it's a big maze for a first dungeon. Difficulty is very tough at the start, but after I captured a minotaur things became easier as well as learning when to run away rather than fight (especially for the oni). The final boss was a decent challenge with Harold being level 23 and my 3 demons being level 19-21. Also, I don't see an incentive to selling all my demons since a team seems more beneficial. Maybe selecting which demons to sell rather than selling them all would help.