It's okay...
The concept was good, but the graphics and music and lack of any visible effort wrecked the game. Like I said, the angle/viewpoint's relation to the characters profile and backgrounds drawn perspective is non-existent. From where the player see's the character, he is facing out. However, the civilians and enemies are all placed directly beneath him. He holds the (rifle?) in one hand and never needs to reload. Adding some animations of him reloading and including an ammo bar/gauge would improve this game. Furthermore, have the player's viewpoint be First-person as the sniper, and have the sniper on a building, far away from the enemies, who walk on a street in the distance. Maybe make space bar the button to go in and out of your scope. I liked the idea. It's pretty unique, and if pulled off correctly, might be a game worth playing as a kind of stress reliever. Mindless killing with no real objective other than: kill the bad guys, don't hit the civilians. However, these are just my views. My last advice is to LOOK at your game before you publish it, thinking: would I play this game myself, and enjoy it? If you can't honestly say yes, then don't publish. And by the way, the music kind of fits, but is low quality and clashes horribly with the firing sound. Also, because it is a fairly short loop, there is a very noticable pause between each loop.
I hope on your next work you take into consideration my advice.