So, for a little experiment, I counted the renders for Succubus Kingdom and Go!Go!Pizzaboy!
For clarity, I chose Pizzaboy because it started around the same time as SKingdom. In fact, it was listed a month after SK.
Succubus Kingdom
Total Renders/Assets - 2,442
Still Images/Assets - 2,406
Animated Renders - 36
Go!Go!Pizzaboy!
Total Renders/Assets - 10,008
Still Images/Assets - 9,668
Animated Renders - 340
I do want to insist however, that this is not an indictment of SK's dev. The amount of work and dedication that goes into making a game on top of whatever other responsibilities they might have is commendable. We don't know what this dev's life situation is or how much time they have to work on their game. At the end of the day they still have to eat, they still have to maintain their relationships with friends/family/partner, or they may still be in school.
For those of you still reading, be patient. There's thousands of other games to try on this site alone.