Is it possible to get motion sickness from a game? I've never had that happen to me before but well done all the same :)
Low Field of View settings, especially on widescreen monitors, can absolutely give you motion sickness. Look up "simulation sickness" for more details on how it happens. Things like motion blur and head bob while walking can make it worse.
Unfortunately, from the multiple people reporting nausea playing this game it looks like I won't be able to play it unless the dev decides to look into those issue. A shame, since it looks really interesting.
There is no head bob or motion blur, but the FOV is 60 degrees, which is probably too low. I put a "dot" on the center of the screen to help with the motion sickness, but I didn't think about adjusting the FOV. I will try to make a new version with an option to tweak it freely between 60 and 90 degrees, and see if it helps. So thanks for your comment, it's very helpful, let me know if you have other tricks that could help.