I think he had a reason for bolding "looking at manga." I would guess his comment meant that if you chose to go with the facial/character expression path, you should look at more art styles than just manga.
As to your actual question, I'm no artist, but if you intend to get a job in the game industry, there is very little calling for just a straight-up 2d artist. You should at least familiarize yourself with some 3d programs such as Maya, etc.
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