Good music and great visuals. I was pretty confused at first, trying to get a grasp on the how to play the game. Your explanation on the drones is useful, but the powerups aren't explained anywhere I saw, nor are the controls for how to activate them - I mostly figured these out by trial and error.
The procedural aspect seems to work very well and the game overall is polished and has a complete feel to it! Great job!
On a more technical note, I noticed that your game was running with an uncapped framerate and was pushing well over 500 fps on my machine. That tends to cause GPU/CPU usage, fan noise and coil whine to spike in my machine. It didn't affect the gameplay at all, but adding an optional frame cap or vsync toggle would make it friendlier on players' machines. It's really not a big deal, but I just wanted to mention it in case it's something you weren't aware of.