Cool mechanics for the game, very simple to understand, I love the minimalistic game art with glowing effects.
For some criticisms I would be better if there was an indicator for the player if its off screen. It would've felt a bit better if there was some sound effect when you shoot the enemies and a scoreboard.
If you're going to make a update on the game, I suggest adding a shield mechanic, like for example when you hold down right click.