"categorise it as" is correct and usable in written English.
You can use it when you want to classify something into a particular group or type. For example, you could say, "We need to categorise this document as confidential."
It was short, and its makers didn't categorise it as a game, as such, more an interactive experience designed to stir feelings of empathy and remembrance.
To categorise it as rap is to understate its originality and appeal - we need another word to describe a melodic talking-vocal style, now that product careerists have made such a travesty out of the American hip hop legacy.
This alone is enough to categorise it as a failure, whether or not it has achieved its aims.
If people want to categorise it as a black issue, that's weird.
David Kosse, president of international at Universal Pictures, is quick to dispel any suggestion that Hollywood incursions weaken foreign industries: "You could categorise it as more competition, or you could categorise it as more support.
In so far as Walking Stories features choreographed activity to music and pays attention to the language of bodies, it's reasonable to categorise it as dance.
For some reason I've never really given much thought to the company or its products; for some reason I had categorised it as a manufacturer of interchangeable, small, boxy cars.
Addwish's wish search feature works by suggesting items as a user types — then either categorising it as a "manual wish" — for items not in its databases — or providing specific product matches that tally with some component of the search, giving plenty of scope to push promoted products up the list of suggestions as users browse for gift ideas.
Last reprinted 20 years ago, Amazon categorises it as "a hard-to-find title".
Reporters Sans Frontieres (RSF) categorises it as "an enemy of the internet".
The researchers have provisionally categorised it as already vulnerable under the authoritative IUCN red list of threatened species.
