I caught the first episode. It's pretty cute, and close enough to the movie to be a related cartoon, but just distant enough that you don't need to see the movie to get it.
It takes a few cues, probably unintentionally, from Star vs. The Forces of Evil, visually and thematically. Oh seems to be a combination of his movie characters and just a hint of Flapjack (considering the executive producer). All and all, I'm really digging this series, and at least Matt ones came back to perform his character in the movie. It would be silly if they didn't as he's Pig of Pig Goat Banana Cricket anyway. His character seemed to be more in line with his others than the movie version.