If you loved Monster Planet of Godzilla, try Kamen Rider Black: Hurry to Demon Island!
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Monster Planet of Godzilla
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Kamen Rider Black: Hurry to Demon Island!
What they share
Theyboth carry the playful mood tag, and they sit in Science Fiction territory. If that's the register that drew you to Monster Planet of Godzilla, the second film will land in a comparable space — through a different lens.
playful
What Kamen Rider Black: Hurry to Demon Island! is
You sense something is rotten when Tokyo kids vanish. You tail a suspect bus until it plunges off a cliff, but you survive. With a fisherman's help, you reach the isle. It's Gorgom territory. Konishi's flick hits that late-80s stride, when kids' stuff got dark but still sold toys.