"ZMercury" is a very fun and addicting game. The object is simple. Just shoot and kill the enemy planes and get hit as least as possible by enemy fire.

Pros:
Graphics: The graphics of this game make it pretty clear and suit the game
Controls: Just the [2nd] and arrow keys
Gameplay: Fun to play and has a high score table, so you can try and get a higher score every time. My high score is 2723.
The game has very smooth gameplay and scrolling.

Cons:
Repetitive Play: The level is the same thing over and over again. You fight through several enemies and the whole thing starts over again. It is just the same sequence of events over and over until you die.
Playing for the first 20 times: This game is very difficult to play when you are a beginner. You will die a lot, and it won't be fun. But the important thing is to develop a pattern to dodge the bullets, because the enemies shoot in a similar pattern each time.