Decent attempt! The art and animation is great! Looks really good. I also liked the music and the theme. Very cool!
There was a problem where when i would start the game, the enemies would kinda bunch up, glitch and bounce around because they were colliding with each other. I think it would have been better if you spawned on screen rather than off screen. Whether that was a bug, im not sure, but i was a bit confused at first. Also at the other end of the screen you could go off screen. Would have been cool to have it scroll across the screen.
Overall, good job. Well done!