Hi,
I like the graphics overall, and the enemies seem good and seem to have good variety.
I'd focus on the player controls, though. You want to get them smooth as butter, even if it means being able to project more at once with each enemy hit taking less damage.
Something I'm starting to learn is that a lot of players seem to like rapid-fire items that do less damage, over having just a few clicks. Now it might depend on the game too, but I think if you could make things more rapid-fire for this game, it might improve it a bit.
Something I learned during the playtesting stage of one of my games was that a large portion of the fun factor had to do with player controls.
On a similar line of thought, I think the whole game needs to be a bit faster.