This was overall really solid!
The idea is a nice one, it nicely adheres to the theme and it's nice to play. You're controlling everything with a single button (and if you want to get really particular about the 'one button' theme you could just make it so that left click restarts the game when you're dead or haven't started yet). The idea is to make it harder as you go on, and it's strategic that way. It requires you to practice so as to understand the physics and develop the best tactics to navigate and take out enemies.
Great game!