Very good for a first submission. The graphics especially are very nice. I very much liked how smooth the movement felt and the small trails. Full marks on that.
I had some trouble with the mouse controls using the trackpad, as I couldn't shoot while moving. I'm not sure if that was the result you wished for or just a result of the trackpad mucking the controls.
I also encountered a weird bug where I escaped the game window somehow, although none of the enemies could follow me. I tried returning in game, as well as shooting from outside, but nothing seemed to work.
A suggestion would be to put a way to regulate the volume as the music was nice enough but a bit loud.
Overall very good job!