In case you're not familiar with the World of Revilo, it's a campaign setting nestled firmly within the bounds of the 5E TTRPG system and can be inserted into an existing campaign or can be run as a stand-alone setting. Most of Revilo's adventures take place on a large land mass located on a planet which used to be a mighty god named Creedona, who is now lying dormant. The lesser gods lay claim to various areas on the map, such as the destructive sea god Anaxygosal who smashes the ships of those trying to leave Revilo once they become stranded there. The world of Revilo is isolated, similar to the plane of existence Strahd's castle and surrounding lands occupy away from the main game world, but it is theoretically possible to leave although most are killed in their attempts. Players can play as one of the many anthropomorphic races found within the pages of the Campaign Setting or Bestiary, or they can be one of the standard 5E races who become stranded in Revilo and are known as Outlanders. There is no player handbook, and so players can just refer to their player handbooks for whatever game their DM is using such as D&D, Pathfinder, or others.
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World of Revilo Campaign Setting: The campaign setting book is packed with races, subclasses, and the larger history of the world of Revilo and the ways in which the politics and religions of its races and cultures interact. What I found in the pages was a very passionate artist and D&D nerd bringing to life a world he'd created as a conduit for his art. Brian Colin created the world of Revilo (the name is an anagram of his son's name, "Oliver") in 2009 after he finished his first life-sized sculpture of one of the creatures found within the world. As he made more and more of the sculptures, he realized he needed to craft a world and a mythology in which to place the creatures. The campaign setting is very anthropomorphic oriented, and the art is largely based around Colin's artistic vision, so it may turn some people off. Most races found in Revilo seem to be variations on bird people (Cokathralis), goat people (Driademus), lots of dog people (Grinataur, Hassanavul, and Procynolite), pig people (Sorcia), and lizard people (Burnadazi) but there are some other interesting and seemingly unique races such as the two-faced Greyskrulls and the semi-aquatic, 12-eyed Hystracathies. If you're looking for new classes, unfortunately Revilo only has by default your standard classes from whatever game you're using as a template (D&D, Pathfinder, etc). But it does have a couple of quirky sub-classes such as the College of Gourmet, which is a Bard subclass specializing in food that buffs your characters, and a couple others in addition to some campaign-specific backgrounds, feats, and weapons. Overall, if you don't mind an anthropomorphic homeworld and it's one that your characters would have fun in, I think that Revilo could really work. The world and its creatures feel a bit cartoony, so for those who want a more serious game - furries who imbibe Rinklesnir Rolls in the heat of battle to give themselves advantage on attack rolls may be a bit too much to handle. But if your players are lighthearted and enjoy quirky monsters and creatures, Revilo might find them right at home.
Revilo Bestiary: Boheum's Guide to Monsters: The best thing I can say about the companion bestiary volume to the core World of Revilo Campaign Setting book is that together, the books are very cohesive. Almost all the creatures included in the bestiary look a part of the world of Revilo. This is because Brian Colin, the creator, is responsible for pretty much all of the art direction and aesthetic. Thus, all the creatures look like they emerged from the same source, in an evolution kind of way. This makes the world of Revilo's monsters very creative, and very authentic to the world of Revilo at large. However, this is also a drawback if you plan on using the bestiary for your own games not set in Revilo. I'm sure a determined GM could reskin some of the creatures to make them fit in more with the other game worlds out there, but these monsters just seem so unique to the world of Revilo that they would, I think, be a hard sell anywhere else. However, that may be coming from the fact that the illustrations are all very well done and super creative but came from what looks like the same source - most likely Brian Colin himself.
In Conclusion: Overall, the World of Revilo Campaign Setting is a fun, interesting place to explore for adventurers who don't take themselves too seriously. If you've got any murder hobos, I wouldn't recommend this setting because they'll want to kill literally everything they come across. And for those who aren't into the anthropomorphism prevalent in Revilo, I'd also caution them to stay away. And finally, Revilo is a world that relies heavily on religion and gods because the gods are sometimes literally a part of the landscape, so if you or your players aren't generally interested in religion or its problems, you may want to stay away. I would recommend Revilo for a younger player base, because the world seems so energetic and chaotic. The creatures are bright and creative. The NPCs are pretty much all furries and you want to give them a hug. Yes, even Fatuma, the weird shapeshifter.