I installed the game today and I really like it.. the only major issues as of now is the mouse movement. It slows down and accelerates depending how quickly I move it.

It makes aiming nearly impossible. I tried playing with the keyboard for now, which is a bit pain in the ass.

Critical bug and it should be fixed immediately in my opinion. Most players are NOT very forgiving and will quit and talk crap about the game.

I think the idea of this game is brilliant.

Is this issue being fixed or is it at least on the to-fix list?

Change your mouse sensitivity with computer settings what not.

CortexBrain, if I recall correctly, the devs said in the twitter feed that the mouse acceleration bug has been fixed for the next version.
Try playing in windowed mode, it seems to have a smaller effect that way.