I love "Bubble Bobble" (1986) and "Puzzle Bobble" (1994), but "Rainbow Islands" (1987) and "Parasol Stars" (1991) feel a bit childish to me, and I find that interesting...
They all have cartoony graphics – almost the norm before games went all dark and gritty like everything else – and look designed for children at first glance.
So, what's the difference? I'm not really sure.
The enemies in Bubble Bobble have a creepy vibe to them. Maybe that's it?
And what about these?
"Kirby's Adventure" (1993) is unquestionably kid-friendly; "Commander Keen 4" (1991) features an actual kid; "Lemmings" (1991) is so cute; and "Magical Chase" (1991) is the very embodiment of a cute'em-up.
None of these feel childish to me. In the sense of "for kids only, adults need not apply" or "videogames are kids' stuff".
Why is that?
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Here's another example of narrowing down a game to a younger audience: "Mega Man" (1987), "Mega Man X3" (1995), "Mega Man ZX Advent" (2007).
Each of these improves on the visuals and complicates the mechanics, but none of that makes much of a difference in audience.
What does make a difference are the intro sequences and text boxes. As more of these are added, the harder it is to ignore that the backstory is (has always been) inherently juvenile.