Beyond the similiar colorfull graphics, this game has nothing to do with splatoon. Couple things to improve such as the graphics, a more clear and engaging home menu, and combat style.
Graphics are good, but they can be better. Homeever, it is to highlight the this a free to play game. The home menu is a little complicate to understand and fail to engage you with the game. And last but not least, the combat mode is fun but, needs improvements. It is hard to keep track of your opponent when fighting. You can easily lost track of your enemies by hiting them so hard that make them fly away; it is hard to taget them back.
In conclusion, this is a fun and nice game to play. Although there are some areas of the game to improved, this is a tittle worth to pick it up (it's a free game after all, what can you loose?).