This is a pretty neat game. I like the strictly black and white color scheme and the geometricness, and showing health loss by filling the shapes is a really nice touch. A few notes that I think would improve the overall experience.
1. Right now, the cursor position seems to be the top left corner of the cursor image, which seems very counterintuitive to me. I would prefer if it was in the center of the image.
2. As others have mentioned, I think I would prefer a shared health bar. Which would maybe make the game impossibly difficult and you'd need to rebalance it, but right now, the most efficient strategy seems to be to completely focus on the white side first and once you've got rid of all the enemies there, there's literally no way you can lose anymore and killing the enemies on the black side just feels like a mindless chore.
3. I think a small "ceasefire" period at the beginning of each level would feel more fair. Right now, sometimes you just get bodied by triangles when you start a new level and there's not much you can do about it.
4. I would prefer if the music wouldn't restart every time you restarted the level / entered a new one.
Still, all in all, a pretty cool idea and not a bad game.