Doodle Sky Pro ($0.99) by OF-Games is a path drawing shooting game that manages to standout among the masses.
Doodle Sky exists around a simple concept commonly seen in the App Store: shoot down the enemy before they shoot you. It comes with 40 unlockable levels and a final Death Mode. The game starts with 8 friendly aircrafts, each with its own unique abilities, making each level a new experience as the pilot.
I anticipated gameplay to be similar to that of Firemint's Flight Control, but was surprised to find that the controls were less accurate. This isn't necessarily a bad thing - in fact, it makes for better battles when you can't make hairpin U-turns. Basically, the plane follows the most direct route, which isn't always the path you drew.
Doodle Sky is more challenging than it looks. Don't expect to knock this one out in an hour or two. You'll find yourself playing levels over and over again to unlock the next one. Now, I know what you're thinking, "You probably just suck at playing iPhone games." Well, think what you will, but I guess the only way to find out is to try it yourself. Luckily for us, the game isn't too frustratingly difficult. The developers really did a good job finding that sweet spot between being so easy it's boring, and so hard it's impossible.
The controls take a little getting used to, but after the first few levels, you'll be ready to take on any enemy. Unfortunately, you'll figure out that you can't win with brute strength alone. Well, you actually don't have any brute strength. The aircrafts that you fly (or point at) are barely stronger than the enemies you're attacking. You spend most of the time finding different angles of attack to do the most damage, while avoiding taking any hits. This takes a little practice, especially with the less than natural feeling controls. Try to not attack head-on with the enemy, you'll barely survive taking on the smaller pawns.
Doodle Sky offers a wide range of level types including: deathmatch, timed shootouts, and defence that will keep you interested. Varied level types, multiple aircrafts, and hidden items ensure you'll be taking more than a few tries at earning all the Open Feint achievements you can. Not to mention showing off to your friends on Facebook and Twitter. I haven't tested this on the iPhone 4, but the graphics look gorgeous from any angle - at least for doodles anyway.