Scratch

If you've every played SAS: Zombie assault(1, 2, or 3) you will know the mouse scrolling technique where you can use the mouse to look around on a top down view scroller. I made one of these before but I made a new one with shooting. The bullet moves with the background. So if you shoot them move down, the bullet doesn't stay in the same place on the screen. It will move up with the background. I am planning on using this engine for an online shootout game. I'll also use this for dungeons in Adventure RPG(but without bullets, arrows and swords instead.)
Link: http://scratch.mit.edu/projects/sccar3/2759885
Feel free to use this, but make sure to give me (and maybe SAS: Zombie assault) credit!