Cool game. Smooth control, I imagine it could be better with a joystick. It would be great to have other consumables. like a laser that moves enemies away so you can go around them easier and one that lets you pass through obstacles
I agree that when enemies are aggregated it's become more diffcult and very is a need for something to separate them.
My quick fix was: enemy number is non-stop recorded in code to avoid to much spawned enemies for this reason.