I do not think I have seen GIFs in the storygames I have read. I want to include 1 or 2. What is your opinion regarding GIFs? And I want to be sure that other readers will be able to see it
There are GIFs in 'Kill Aman's Mustache', as well as a youtube video, and lots of other things.
It depends on the size. Too big a gif and it will just end up being sloppy and an annoyance for those with crappy comps.
If you're gonna include one, I'd recommend using Gfycat or something similar.
And if it is a rather large GIF, you should consider using a video instead.