Commando Jack is an android port of the same game now on steam.
There is barely any story at all. Basically, aliens have invaded earth and it's up to Commando Jack to stop them.
Gameplay is a mix of tower defence and first person shooting. Each level starts you off on one side of the map with a turret, trying to defend against the alien invasion. You have limited time at the start to build towers and set traps for defences before the waves begin. Besides building defences you can also switch to your main turret and shoot the aliens via first-person. Enemy waves get more numerous and stronger as the level progresses. The aliens will move towards you main turret and try to destroy it, which results in a gameover should it happen. After each level, you will earn up to 3 stars depending on whether the enemy was able to attack your main turret or not. You also earn credits, which are used to buy/upgrade turrets at the store before each level. There are variety of aliens including snipers, tanks standards and elemental which all have certain strengths and weaknesses. A variety of turrets are also available including machine gun, rockets, mines, lasers and sand bags. One of the problems I found was that when you upgrade turrets' you don't know how the turret was improved as you don't get to see any statistics.
Graphics aren't great. The android history, shows off on the low detailed models for guns, environment, turrets (everything really).
Sound effects are quite poor. Weapons sounds are basic. Background music is forgettable. There is not voice acting in the game.
Unless this game is highly discounted, I recommend that you stay clear of this game. It's not that this game is terrible, its just that there are dozens of games which do a better job at representing the 'tower defence genre' and cheaper too.