I saw this movie twice in the mid 80s and I still can't get over how fascinating, touching and profoundly deep it was (excuse the tautology, but it is). It can definitely hold a child's interest (I was one) but it's not really a cartoon meant for kids. The ending and the overall atmosphere haunt me to this day, to some degree thanks to the soundtrack which is out-worldly. Rumen Petkov's style (which is rather peculiar) definitely adds to that. It's a shame the movie hasn't been shown in Bulgaria for years, it's a shame there's no way to obtain a copy, and it's definitely a shame people worldwide associate the title with Disney's "Treasure Planet" (which, compared to its predecessor is, to say the least, silly). Not that they ever had much choice.