Visuals are fantastic ! Love the pulsing projectiles. I like the controls, but like you said, a little hard aiming. Would it be easier if the projectiles came at you faster? Then you could see and get a feel for the projectile's path. Or, what if the projectiles came at you in 1 of 9 paths (grid of 3 x 3). They would then be more predictable. Just random crap thoughts I had.
You should put another couple hours into it ... at least. Good Pew Pew Fun !