Very cool concept. I like the impact feel when you deflect a shot with the shield, with time slowing down and all that. The controls (specifically with the shield section) feel a bit awkward to me: by instinct I would want to do some kinda circular movements with the mouse to rotate the shield, but here I'm supposed to move it left or right to rotate. That really throws me off during the harder sections.
I couldn't progress further than the first couple levels where you have to deflect shots, but would certainly give it another try, this is very cool!