If you’re not worried about challenges, maximizing stars, or your score, then there are plenty of things you can completely avoid doing. For starters, there’s no need to rescue humans on the ground—they only give you a score and make you an easy target to hit. There’s also no need to destroy certain parts of the map. For instance, in the first level there’s a brick tower that gives you a few stars if you destroy it. Also, you don’t have to focus on enemies with no chance of attacking you, like the dune buggy.