Oninaki is a decent isometric action role-playing game. The game has lots of potentials, but it missed many areas, including story delivery, enemy design, and monster variety.
Oninaki excels in one area, though, and that is in its ambition - it is the isometric equivalent of Xenoblade Chronicles 2, albeit with many areas becoming mediocre as already shared above. The core strength and pull of the game are in the collection of Daemons, upgrading their individual class trees, and the loot hunt for the best weapons. That core gameplay is enough to make a great game, like in the case of the first two Diablo games. However, the monster and enemy designs are bland, boring, and lack the challenge fit for the nature of this game. What is the use of an epic, legendary sword if the enemies you are facing are dull penguins?
Enemy design is crucial to make an engaging combat-driven game. Still, Oninaki is a good action RPG, though it failed to realize its full potential.