Extremely impressive visuals and art! I like the concept and the level design, and for me the performance was solid in full screen. But I didn't really get the right click rotation logic. I really wanted to keep playing to see the whole thing, but got too frustrated. I don't mind difficult or even some rage stuff if I screw up, but not understanding the basic controls after trying for several minutes isn't my type of fun. If I don't feel like I can improve with practice then it's not something I'd keep playing for long. As a counter example, Spelunky 1/2 are very difficult and it can be frustrating to die after a lot of good progress, but it mostly felt like my "fault", and indeed with more play I got better at those games until I beat them.
Anyway, great job still, I think if you make the controls more obvious to understand (not necessarily easier) I think this could be a commercial game!