Would be interesting what the people who picked 'Only if it had manga-style artwork' thought when manga art can be varied. Well, arguably the default is the 'big eyes simple face' type, which is what most people think is the style. But what about those who draw with realism like Hojo Tsukasa and Inoue Takehiko? Or straight-up cartoon-y like Crayon Shin-chan and Chii's Sweet Home? Or those almost realistic but has cartoon-ish features like Urasawa Naoki. Then sometimes we have those odd ones like Kono Sekai no Owari e no Tabi

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The early bird may have caught the early worm, but the late worm survived!!

Original publication decides what the series should be under. If you publish on a japanese website or publisher, manga. Thats my bit.

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Internet Lurker At Heart

Yes, that's why I didn't choose that option. There's certainly a set style in Japanese manga, but that alone isn't enough to define a manga. There are a lot of exceptions and variations, that's the reason why there's an "Atypical Art Style" category here on Baka-Updates.