I love that mechanic!! My first impression was "Well, so I just have to get lucky." But then I noticed that the corresponding side lights up just before it fires. So you have quickly move the ship to shoot in the direction you want. Really fun concept!
I also found it really cool that your lives are equal to your weapons. Not to mention the graphical style, which is just gorgeous. Really clean and striking art-style, well done!
My only feedback would be to make it a little clearer which side is going to fire. Right now it goes from light-yellow to dark-yellow. Maybe a size increase, added border or an extra UI element or something would make it a bit more clear. But at the same time, that also keeps the difficulty up, so if you made that decision I respect it.