With todays games filled with gimmicks and ridiculous 'achievements' it's nice to see a game like this. Intriguing plot, fun game play, in-depth characters. The upgrade system was wonderful, the dialogue was extremely well thought out. xdanond has taken flash games beyond anything I had hoped to see.
As Tyrth said, pressing J works. The attacks are too fast for their to be any real strategy to this game. Earthquake is useless. The guns are strong but unnecessary when you can just tap J until everything is dead instead.