I liked this and think I watched it in the cinema as a boy too. I watched it again recently and, though dated, it is fun and entertaining - esp if you likes cats. I found the dialogue hilarious at times.
BUT what makes it stand out today is how it is like a forerunner to ET. Alien on earth, has to go home, cue government goon squads chasing the cat from outer space and his new family,.
There is EVEN a chase sequence with flying bikes. At night. With a moon! Less emotion here than in ET, more humour, and a different 3rd act, but...
So even though many things influenced ET (Indian screenplay The Alien 1969; The Day The Earth Stood Still, classic 1950s Robert Wise movie), this MUST have done too - maybe it influenced the ET screenwriter.
This is basically ET before it happened - with added cat value.