90% Studios (formerly known as 90% Knuckles) are the developers of the Purrfect Apawcalypse series. The team is made up of Denny and Andy. Their sort-of mascots are Pancake the hamster (rest in piece), and the gerbil duo of Butter Rat and Impossible Burger.
Denny is the creator of Purrfect Apawcalypse. She's responsible for everything except parts of the programming, music for the third game and the designs of the Purrsonas in the background of the third game. She created the first game for practice (intended to be a game jam) and due to its popularity, a second and third game was made. Currently, Denny is working on the Cool Kid Cody series.
Andy is super-tech-support for the series, meaning he helps out with the more complex programming. While Denny was working on the PA series, Andy lead the Panel Royale project. Denny had the following to comment about Andy: "He's an epic programmer and super good friend!!" Andy's personal website can be found here.