Gravity Bonk

Mouse - Red ball follows your mouse

Left-click - Holding left click speeds you up for a moment

Push the ball onto the enemies that are flying towards you. The ball gets smaller over time, but when you hit it, its size gets back to normal. Make sure that you are kicking it a lot.

You are a red ball, that is getting invaded by other shapes. You can't kill them on your own, so you just kick a ball into their face.