I agree with Tricky_Fat_Cat for the mouse aiming. Not seing the distance of the movement didn't bother me as it is always the same so you dash 2/3 times and you kinda know it for the rest of the game. I realy love the art, i'm usualy not very fond of 3D pixel-art but you did it realy well here in my opinion. The dash animation feels really good, a find addition could have been some screen-shake when the player hits an ennemi. Like Mystical_Pidgeon said a smaller cooldown could feel better. I imagine static ennemis disposed in Z-shape for exemple, the player would have to zig-zag quicky to kill all of them, it would feel great ! Anyway that a cool idea, if it wasn't for theses littles things it would have been one of my favorite games ! Keep up the good work (and art !)

It's a fine idea with good realisation, however there are some problems from my sight.

1. Aiming controls are akward. Most of the time I struggled with aiming intead of enemies.
2. It's not convenient when you can't see the distanse of the movemen.

May be it'll be more interesting, if you make aiming with mouse and add some kind of mechanis which allow player to choos the distance of the fly. 

Pretty fun, my only complaint is the cool down, I think this would have been a lot more fun if I could zip around quicker.