Push up arrow key to go forward in the direction you're facing, left and right arrow keys are for rotation, and space to shoot. Shoot the zombies, and take advantage of the damage your bullets do and the bullet speed, but don't rely on your reload.
See my other project, the normal shooter game. Credits to warfame on that one. I am also going to make a too overpowered one too. https://scratch.mit.edu/projects/178574427/#player