beeen struggling with this for a while now, just gave up the game till they get this ironed out. It seems if you move your mouse to the right too fast- character looks straight up, and if you move mouse to the left too fast- straight down, sometimes these vertical results are transposed. I have tinkered with this issue for some time now. tried all the internet mouse fixes and thus far have had no success. I hope this is resolved soon, but hey, it's alpha and I can be patient.