This is cool.
I don't know FIST, but here are some suggestions from an outside point of view.

- Sometimes you have sound effects, but the rest of the time, total silence.
Sound effects and a little juice are great, they could elevate the experience, be satisfying.
- When creating the characters, since there is a lot a traits etc. a little reminder window of what this trait/class is when you click on it would help.
- i didn't find the character sheet button at first. The icon is not fully saturated nor obvious. Maybe it could be a regular icon file (like a rectangular piece of paper with a folded corner) and be fully bright green.
I see that the info boxes exist inside the character sheet, well, great!
- The 3D view is harder to read than the 2D view. You can't really tell at a glance where the characters are. I am not certain the 3D view is worth the effort you must have put into. Wouldn't it be easier to focus on the 2D? and have it more refined and less simple?
- The controls only work in the 3D view. When viewing 2D you can only zoom and not move around.
- I use a lot of 3D software for my job, from autodesk's to blender, zbrush and such. Your choice of moveset is not easy to navigate and demands a lot of keys. Why not use the standard from other 3D softwares? three keys to hit: move/rotate/zoom, and all the movement are made using the mouse or scroll.

The mission tables are cool, and it is fun to have it be a moving point on the world map.
Keep up the good work!

This is WICKED!