Steven Universe started out seeming goofy, but turned out to be a fantastic coming of age story though; Genuinely one of my favorite cartoons of all time. Excellent world building and does a great job of handling complicated emotional topics without infantilizing the viewer.
If you only saw the first couple of episodes, you should definitely give it a proper watch. If nothing else, give the song "Here Comes a Thought" a listen, I assure you it's worth the time investment