Kingdom Hearts Unchained is a mobile offshoot of the Kingdom Hearts universe, but still manages to have a good relation to the storyline of each game. The aspect of the game is that you are one of the chosen for the keyblades, and you are fighting off the darkness in each of the worlds. You don’t see many of the actual characters from the series in person, but they come up frequently as medals, which is shown below.
The gameplay is similar to the hack-n-slash progress, you go thru the entire stage and tear everything and everyone up. You have the option to avoid battles and just head straight for the target they name in the beginning, but the missions they lay out for each stage steers you more towards finishing them off rather than avoiding. Once you finish off the enemy in question you are successful and then get rewarded with all of the things you find sparkling on the ground and as rewards from sealed chests that open at the end of a stage.
Most of your customization actually comes in keyblades and clothing. Your keyblades get stronger with the medals you attach to them, affinity with slots for multipliers and also quality of these medals influence this too. Your clothing is thru an avatar board. This board gives you the base outfit and as you use Avatar Coins you unlock other pieces of it and also get extra benefits that build on your character. This not only applies to ones of your own gender (they have one for each), you can fill both out and unlock bonuses and clothing for all.
It’s definitely a fun game overall, it has the design of the Kingdom Hearts series and follows a storyline close to the games themselves.