If the singular were meant, the indefinite article would be present. This sentence refers to Norwegian cinema in general, rather than one specific movie.
Dead Snow and Trollhunter were both great xD I'd also highly recommend The Wave (Bølgen).
Hodejegerne was really, really great. I watched it in norsk and that was so nice that I replayed it so many times
Norsk film=movie og norske filmer=movies. Her er det feil. Eller er det mer generell betydning - norsk film som flertall?
It's used in a general sense, yes, speaking of Norwegian cinema as a whole.
A very clunky modern use of a collective noun 'Film' . (As is also 'Filmic, societal and comedic' in my book.)
Can someone recommend any Norwegian movie for the purpose of practicing language: listening, talking, easy sentences etc. ?