Sky Troops is a fun fly and dodge game in which you have to take on the space aliens and enemy aircraft. Pick up the crates containing bombs, money, and first aid kits. If you see any people waving at you from below, fly over them to rescue them. After each level, you can head to the menu to upgrade your plane. Once you've unlocked all the upgrades for one plane, you can move on to purchase the next one, boosting your speed and maneuverability. Score enough points to unlock the boss levels.