The game is remarkably open and simultaneously contained. Each level is inside a bubble, and you can pop in and out fairly quickly. Sometimes out might be your best course, since your limited field of vision means you may have popped into something that is going to pop you.
If things start popping you, you revert back to earlier levels and can work your way back up to your better state by popping more. But sometimes running is good. There are some safe bubbles where you can be the bully and pop the helpless denizens.
Play this fun and very addicting game for free at www.armorgames.com.