Hm, I don't have a linux machine right now. I just used the Linux build option on Unity and hoped it would work :(
Maybe I will get an WebGL version out soon, that should work on Linux, too.
I was actually playing with the idea of exporting animations to sprite sheets, too! I really want to add this features as it would make my tool so much more useful, but I don't know when I will have the time for that.
Anyways, thanks for your feedback!