I just finished my yearly viewing of this. It's so good.
If you haven't seen it, I highly recommend giving it a watch.
Lol yes, these are shots from Over the Garden Wall, but the tone is absolutely not like that. It's more of a cute/sweet/silly show. It deals with some slightly heavy topics, but definitely at a kid's level and things always resolve quickly. I'm sure both you and the kids will love it.
For reference, I'd say the official trailer is far more representative of the tone. https://youtu.be/watch?v=36mAsVSH_-s