This word suggests curation. "Top" likely means or "Top 200" —as in, the wrapper included a pre-selected list of the 200 most requested assets (e.g., the "Boris" character, the "Hospital" background, the "Explosion" sound effect).
To understand the keyword, you must first understand the infrastructure of the original GoAnimate (pre-2015). goanimate wrapper 200 top
: A proposed evolution aimed at bridging legacy Flash animation with modern web standards, utilizing emulators like This word suggests curation