The characters look unique, the idea for the game looks semi-unique
(I'll explain), the gameplay seems to be like Paintball, being someone who's played paintball before, finds this to potentially very fun, However... The game reminds me of De Blob, another game that was on Wii, where your goal is to absorb colors and then paint multiple cities and towns before a timer runs out, while interacting with characters who come out from underground (they come out from underneath manholes, which is just like that old man inkling), in fact you are a creature that colors stuff with paint, while your foes are inkful creatures, who take the color out of stuff.
Which is funny, when you think about the inklings in splatoon and how they fire colored ink at things.
Infact, De Blob can run out of paint after a while, similarly to the Inklings, as well as move slower when walking in ink (Also similar to when Red inklings walk into blue inklings ink)
Not saying that Splatoon may be bad, but I just think that is took heavy inspiration from that game.
