Tag Attack is played entirely with the mouse. Your ship follows the mouse back and forth at the bottom of the screen. Hover the mouse crosshairs over incoming alien ships "tags" them, launching a seeker missile to destroy them. Crashing into an alien ship, or being hit by one of its missiles depletes your shield.. Various power-ups are available, including bombs (activated with a mouse click) that clear the screen, aimers that increase the area of your tag-crosshairs for a short while, and repair spheres that bolster your shields. Lose all of your shield and its game over, man.
Tag Attack is a visual delight, crammed with colorful nebulas, pixilated explosions, and swooping starfields. Sometimes the play-screen does get too busy and tiring on the eyes, but it really does feel like fighting your way through a low-rez galactic war zone. The unique control scheme takes a little getting used to (though the opening levels are nothing if not too-forgiving), but once gotten the hang of, it makes for an interesting shift. It allows for a little more of a strategy focus: rather than just trying to fill the screen with as many bullets as possible (which, admittedly, is my typical shooter plan of attack), one must balance avoidance, aiming and item collection in each wave.
Tag Attack is probably a little too repetitious to waste hours on at a time, but I find I keep coming back looking for an ever-higher score. It's easy to jump right in and gets surprisingly intense in the later levels. Could this be the start of a new genre of casual shooters?