I was never able to find it myself. While writing I just guessed it was a gerbil or something. Glad to know you kinda found it and that this game was not just some fever dream.

[edit]

By the way, Internet Archive adds some sort of translation layer for flash animations so it can be opened in modern browsers including on your phone:

https://web.archive.org/web/20050127013251/http://www.jabtv.com/bigassgame.php