Dont let them through (Joseph Chhetri)

You are task as a player is to kill the zombies before they reach the bottom and destroy the power source, that is holding this little world together. I made this little game in vanilla javascript as a portfolia game. CONTROLS:- UP / DOWN ARROW key to NAVIGATE ENTER key to SELECT. UP ARROW key to JUMP LEFT / RIGHT ARROW key to move LEFT / RIGHT. SPACEBAR key to SHOOT