What do you get when you cross Super Monkey Ball’s Monkey Fight with the Pacifism mode from Geometry Wars?

Collision tasks you with keeping your white ball inside an arena for as long as possible. It’s complicated by the gradual appearance of more and more red balls, some of which chase after you and try to bump you out, others remain still but continually shoot at you.

You can shoot back, but like Pacificism the key is to try to stay out of trouble at all times.

What’s the highest score you can get?

Collision [Kongregate]