This is one of my go-to games, especially for cons. It never fails to delight folks, allowing for both cute silly fun and heart wrenching emotional moments. I've run many many one-shots, and it holds the record for the longest campaign I've ever run.
This game is very much a slice of life game, and easily falls into the Iyashikei (healing) genre, with a tone similar to what you'd find from Yotsuba&!, Yokohama Kaidashi Kikō, My Neighbor Totoro, Hakumei and Mikochi, and The Helpful Fox Senko-san (which is literally about an 800-year old fox spirit who shows up to help uplift the spirits of a young working man.)
My biggest critique of Golden Sky Stories is that the system is a bit fiddly, as you have to keep track of multiple resource pools which cascade from one to the next. You have Dreams, Connections, Wonder, Feelings, Memories, and Threads. And, several of these resource pools do similar, but slightly differnt things from one another; Wonder activates Powers while Feelings boost Action Checks, but both of them turn into Memories, and Memories can be used for either Powers or Action Checks. You also have the bit of back and forth math of keeping your Connections rankings in sync with the other Players. But, this really only becomes a problem when you're running longer multi-session campaigns.
That said, GSS also has one of the best bennie mechanics of any game I've ever played, in the form of Dreams, where any player can applaud the actions of another Player at any time for any reason. It's a great way to get folks to play to character and to cheer one another on!