I would not give up. Last time I showed you a dialog I created using picwin. Here is a video of pacman, also in picwin.
https://www.youtube.com/watch?v=gthfId1uIb4&t=9sThis is just some of the things you can create with mIRC. As Wims mentioned, you can always just use a tool to create multiple images then display them and replicate the illusion of a GIF.
another cool game created with picwin in mIRC: