This book should be considered a companion to Zelazny's Hugo award winning triumph Lord of Light and is easily compared to it. Similar in theme and concept if not in plot, it shares that books blurring of the line between SciFi and Fantasy for which Zelazny is justly famous.
As Lord of Light is set on a far away planet where a few have set themselves up as Hindu Gods using advanced technology, so to does Creatures envision a future galaxy where a few also set themselves up as rulers of planets posing as Egyptian Gods.
Grander in scope than Lord of Light, it is ultimately far more cryptic and less satisfying. Perhaps it is the hero of the tale who is far more two dimensional than the hero of Lord of Light. Perhaps it is the underdeveloped protagonists. Perhaps it is the choppy narrative or Perhaps Zelazny simply did not delve deeply enought into Egyptian mythology the way he delved into Hindu and Buddist Mythology for Lord of Light.

The book is more remote, less involving, and more difficult read than Lord of Light but comparisons aside it is ultimately worth the read.