Press the w,a,s, and d keys to move around. Use the up and down arrows to change the volume. In the boss level, use the space key to shoot. Click the speaker to mute the sound(optional).If you want more information about the game, just click the info, credits, or instruction buttons in the main menu.
I watched different youtube videos in order to make most parts of the game. I did some of the coding by myself too. An example would be the speaker. But if you have any opinions in how to make this a better game, just leave them in the comments section.