I liked TWEWY. Quite a bit, actually. The art style, music, and brand system worked really well together, in my opinion, and brought something new to the table. The dialogue was actually witty, which is hard to come across in a game (five words: the pudding of their doom. Lol, Mario and Luigi Superstar Saga reference FTW). It kinda had the whole "kingdom hearts" feel, in that it was a square enix game that wasn't final fantasy but had similar elements and was awesome.
What irked me, however, was the battle system. I swear that it is humanly impossible to fight with two characters at the same time. I mean, I mashed the d-pad for the character on the upper screen and only payed attention to the character on the lower screen, and that was still hard. If anyone has developed some ability to fight correctly with both characters at once, please tell me.