This is the review I wanted to submit, but couldn't because I didn't have an account.
The game was interesting at first, but there's nothing to it; shoot and watch Shang Tsung explode despite the fact that the shots never even touch him. Even touching Shang Tsung physically or letting him pass you by leads to no negative consequences. Be prepared to attack five Shang Tsungs, then wait a while before another batch of three come around; you'll spend a lot more time waiting than actually playing the game. There are no limitations to how many shots can be fired at one time as well; simply hold down the Control key, and cover the screen with fireballs without any difficulty. It needs improvement, it needs a goal, it needs to at least have the possibility of the game ending with a good and bad outcome, and it needs variety; why not have other enemies come out and require more hits to kill? Why not give Ermac more abilities as the game progresses? Work on these things and it will be a lot better than it is now. Also, if you could add sound, that'd be nice, but it's not necessary; focus on the gameplay first, then the extras.

^ he pretty much said everything. You see the game is kinda boring and repetitive. Ermac (the player) shoots fireballs at Shang Tsung without any bad outcomes when you are hit/damaged or when you miss. There should be more abilities instead of shooting fireballs. There should be a bad or good outcome as Jerrod said. Keep practicing and use Jerrod's advice. Overall- 2/5