At lot of interesting and cool artistic possibilities comes when things are colorful, cartoonish and silly, they're a very fundamental way to express ourselves. I always hated this mindset that adults and teenagers should only enjoy dark and gritty things because it's "mature".
On top off that I'll add something: sometimes I feel a bit repulsed when I see footage of a retro game for children doing something a little more wild on youtube and someone in the comment section go "You know, for kids!" sarcastically, suggesting that all kids should enjoy the same type of content. As a kid I liked a few games sometimes were a little more violent, scary, bizarre or dramatic, and I think the emphasization to play safe because "for kids" made things more sterile over time.
Of course I don't think everything should be like this, it's okay to enjoy things that are just cute and wholesome.