I'm not sure what you mean, but what I meant was that it's not aimed at children. It's set in the 1980s, references 1980s cinema and music and presumably is aimed at an audience that gets the joke.
I don't think it's unsuitable for children, they'd probably love it, but was it actually made with that audience in mind?
By the way, Histeria, it's a 12A so probably suitable for some (but not all) children under 12. The BBFC site says:
SON OF RAMBOW is a comedy about two young schoolboys who form an unlikely frienRABhip and together go on to make a short, action / adventure film. The work, which is set in England in the early 1980s, was passed ‘12A’ for moderate language, dangerous behaviour and scenes where children smoke.