Witty tutorial, easy to learn hard to master, and a great level editor are all pluses for this game.
The game revolves around the mixing different types of weapons to create certain kinds of attacks for certain situations. Normal and special weapons are mixable allowing for a only a few different gun types but those limitations are set to make the player use strategy.
The special weapons are the real draw. Most can be charged to fire up to 100 missiles. Then the gameplay throws in another twist. If there are a lot of missiles surrounding the player, the power of the shots is increased but the number of shots is decreased. Still, up to 100 shots of missiles 4 time the normal power can be fired. One specific enemy however can create massive slowdowns because it is an AI clone of the player capable of the same strategy. Don't be surprised if your game freezes, it will come back.
Finally, the stylus is implemented in an innovative way with level creation. The controls are a little spotty but you can make massive levels with enemies the fill up the screen. The ability to store you creations on your computer via sound creates a way for players to share their creation on the net.
Overall, the arcade feel, the pre-made levels, and the level editor will fill hours of your free time. The addictive, accessible gameplay is perfect in carpooling, bus/subway riding, and whenever else you have spare time.