Very rarely do I have trouble with motion sickness from games, but this one did it for me and I had to give it up. I think it was part the levitation and part the disparity between turn/sidestep. (I kept hitting the wrong key QE vs AD for my intended motion and when something else happened than I was expecting my brain couldn't take it)
I did like the mixing and matching of runes, though having to keep doing just the sun/moon before being able to do a combination with them I feel was a detractor. (want to levitate in the area with spikes? cast sun, cast float, recast moon shield. Do this again 10 steps later. In my opinion it would have been better to just be able to cast float)
Fantastic integration with the theme.