Unironically better than I was expecting. It kind of reminds me of Pepper Ann but off the rails. A lot of it is very on the nose but given its target demographic that's fine. There are certainly some cringy lines here and there, but it actually didn't bother me as much. I suppose one thing I liked about Mack and Beefcake was there wasn't any "YOU KNOW LIKE GAY!? YOU EVIL!" type shit. For the most part, they're just treated as characters first, which is what you're supposed to do. I also think the fact that some episodes actually have decent practical advice for kids (and some children in adults bodies) is pretty good. It does lack nuances sometimes, but at that stage of life it's good enough.
There are some big issues though. It is really formulaic, some of the cast are legitimately awful, and many characters are underutilized. A tighter cast would be good. I think that some of the ways that they portray child like "imagination" do work, but it still remains too constrained. There's no way that supposed "creative" children wouldn't come up with things beyond just mashing two basic concepts together, like dogs and fruit.
I think an actual exploration of the Endless would be really cool, it seems there's a lot of untapped potential there. I mean, we already have our id, ego, and superego, might as well go all out with this metaphor. Also some characters are just straight up creeps. Of course, all of this really has to do with the plot and setting, the animation is so-so nothing ground breaking, can't say I love the color pallet, music and sound design are serviceable. Some of the voice acting is actually pretty good, the butt witch especially. All in all, okay/10.