If you want to speed up production of planes (lives/energy), you can do so in the in-game store by purchasing the planes generator for 2 dollars. Or you can use an iTunes gift card that’s been won by using sites such as freemyapps or simply been given to you as a gift for Christmas or something. You can buy more planes with stars, too, although it’s better to simply do the time lapse cheat.
Purchase the magnet in the store to make it much easier to earn stars, because the stars will automatically be drawn towards the plane. The more that you upgrade the magnet, the further out the star magnetism will go. This takes the focus off of currency collecting.
There are two weapons in the hangar that are manual-activation. One is the mega bomb, which kills all enemies on the screen. The other is the laser cannon, which sends an extremely powerful beam out that makes it very easy to kill bosses and other high-health enemies. Buy these to make it much much easier to succeed in the game.
Sky Force 2014 doesn’t connect to Facebook, but it does connect to Game Center. If you have at least five friends in Game Center, you can play in the tournament mode. This will allow you to compete against your friends. Whoever wins the competition will earn some good rewards.
One thing that will make it much easier to blow past the “untouched” medal is the energy shield. Once you activate it, you will be impervious to enemy attacks for a limited time, allowing you to stop focusing on bullets, and to kamikaze-attack the smaller planes without taking any damage.
Want to win the points competition? The more medals you unlock on each stage, the more score multipliers you will earn. One medal makes 2x, two medals make 3x, and so on and so forth, all the way up to four medals, which is good for a 5x score bonus.