Looks like early animation, kinda washed out, came in a black/dark colored paper sleeve for vhs. Obvs general Google terms didn't pick much up, skimmed through wiki's 80's titles, nothing really stood out. Adventure theme, not a musical, seemed light hearted, I remember it from my childhood, we had it around 2000ish, may have been a flea market/garage sale buy. I remember it as a movie may have been shorter though.
It's about children (two?) for sure one male protag, who're collecting/searching these glowing yellow/orangish orbs/worms that I think can float freely? They were the size of rocks or eggs. They might have been aliens or something. It seemed like they were kept in something siniliar to an egg carton. At least one of them was able to move. Parts took place in a cave, as well as possibly ruins, and maybe an island. There was some sort of antagonist also trying to obtain the orb things.
I haven't seen it anywhere since childhood, so I'm guessing it was pretty obscure or just not popular.