I do enjoy the premise of this Cozy MMO. Upon first hearing about it it reminded me of a combination of Pokemon and Wizard 101's Pet system strangely enough.
I did question the depths of breeding and economics in this game if it was meant to be for casual players. Some of the ideas of currency standardization and conversion rates also seem a little complex compared to the premise the game offered. I also wondered why only male pets were eligible to be listed in the "Breeder's Shop" and how "Mythic" pets couldn't pass down their rarity to other pets through breeding.
Overall it was a thorough GDD, but it obfuscates or introduces systems or items within those systems that deviates from the premise in my opinion.