First the bad things: The hero is boringly invincible since he is the king of bandits who could steal the stars from the sky. There is not only a villain of the week and a treasure of the week, there's also a girl of the week. The delivery and construction of the moral lessons can be very heavy-handed. The show is extremely episodic, the only connections between the different arcs are the two protagonists and one minor character.
The good thing: Everything above doesn't matter. This anime is not about building up characters or developing stories. It's building a world of dreams. You could look at every episode with a book about dream analysis in your hand and try to decode the symbolism, or you could just lean back and enjoy the atmosphere.
The first episode starts with a sunrise in a desert with some tombstones, some smooth jazz-pop in the background. A lich rides on a green pumpkin carriage, pulled by the skeleton of a giant prehistoric creature. He gets catapulted away by a blue whale slide-crawling after a carrot on a stick. The stick is hold by a metal construct on its back, filled with bandits of all kinds of humanoid species in all kinds of costumes. They travel towards the capital of thieves, a city resembling depictions of the tower of Babel. The king of bandits is watching this scene, his talking crow on a shoulder, next to a tattooed ostrich.
That's just the first 90 seconds of it, as summarized as concise as possible. All the other 90 seconds that are in those 13 episodes are of similar density. It all comes together in a way that makes my mind wanting to figure out the meaning of it. It's just like a dream.
Also, the hero has a bitchin' transformation sequence.