Your project manager wants you to go back to the Invaders 2D game that you had submitted to the game contest website. Many players reported bugs and said that they could not use a gamepad to play the game. Remember that it was the most desired game.
The code that checks the keyboard is taking into account just one pressed key. It is time to create a keyboard manager class. It must be able to track multiple keys pressed by the user between each rendered frame:
using System.Collections.Generic; ...