Excellent demo, you have the basic pieces needed to expand into a full game!
Could use a sensitivity slider
While airborne, an enemy clipped into me, which then led to me noticing they were constantly damaging me. I'd never have noticed if I didn't glance at the health bar, could use some visual feedback on when I'm hit, as well as generally just preventing creatures from clipping into each other since that loss of control is very bad
Performing attacks in midair are wonky. I'd prefer for my attack commands to interrupt my glide instead of me manually canceling the glide to initiate the attack. Also, while you probably made ranged attacks set velocity to zero, if I do that while falling it also means I briefly stop falling until gravity kicks in again
Love killing Illidan!