What's a good Android game for when I need to kill some time and blow stuff up, but nothing too complicated?

Look, I don't have a ton of time to learn some complicated game with a million rules. I need something I can pick up and play while I'm waiting for a client to show up or when I'm stuck in traffic. Metalstorm fits the bill perfectly. It's got that classic arcade feel – easy to learn, hard to master. The graphics are decent, and the explosions are satisfying. It's not gonna win any awards for innovation, but it's a solid way to de-stress for 15 minutes. Bottom line, it's a good way to kill time without having to think too hard, and that's worth something when you're running a business.