In Earth Defense, the Earth is under attack! Frankly, it seems like we’re always under attack, doesn’t it? This time around they’ve brought a space armada and we’ve brought defense 
lasers, multiple types of bombs and a limited number of nukes, use them wisely.
As you beat wave after wave of alien swarms your tech guys will be hard at work developing new weapons like lightning bombs, black hole bombs and more powerful explosives. These will of course help you better defend the planet.
Alright, now we come to the controls which seem, for most iPhone titles, to constantly be a source of frustration. This game is no different. To plant bombs you tap the screen. To fire lasers you hold down a finger and track the enemy. Even though some of the enemies are fairly large targets, they seem almost impossible at times to get a steady laser on. So small targets plus rapid movement and not very accurate controls lead to some small amount of frustration from time to time. But still, the game is a source of hectic action and entertainment. The good thing is that you can use multiple fingers to direct your weapons so with one you might be firing a laser and with another dropping bombs. This becomes a very necessary skill later in the game when the screen fills with assorted enemies.
Some enemies can be blown up easily enough with just a bomb, this can also then cause a chain reaction and destroy further enemies giving you a score multiplier until an enemy hits your shield. Other enemies are unaffected by bombs and so require a pinpoint laser shot or a longer duration laser blast. The first are not at all hard to hit, but tracking the others accurately to get a quick kill is challenging mostly because of the controls, not so much because of the enemies’ movement.
Also, a lot of power-ups will drop that will give you different bombs, replenish your bomb supply or charge up your shield. Sometimes, there are so many they just get in the way of planting bombs. One might think a strategy 
of leaving some shield powerups on screen for an emergency would be prudent, but more often than not they’ll get in the way and you’ll pick them up when planting a bomb or firing a laser.
The graphics and sound in the game are very well done and definitely help keep your attention. There are a variety of aliens and all of the weapons have some fairly cool effects both visual and audio.
The game looks to be the first in a series of games as it’s called "first encounter" and isn’t extremely long. But it’s not so short as to make one angry at having spent the money. There only the single, linear story mode to play and no extra game modes though so you can only play one game at a time. The game has a standard arcade title progression with stages becoming increasingly more difficult and bosses interspersed. It will certainly have you frantically tapping your screen for some time.
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