Ok. I'll read the description and try again, but I should let you know, I tried all the typical buttons (E, LMB, RMB, ESC, TAB, SHIFT, SPACE) and nothing happened. I even pressed every letter on the keyboard. If I read it and see that the controls are buttons I already tried, I probably won't bother trying again. If you don't include in game instructions, at least make the controls what you would expect them to be.
Edit: just read the description. Arrow keys to shoot? That's the very last thing you'd expect controls to be. Extremely unconventional. It's really simple to type some text into a UI in your game. Takes like 2 minutes. You should know, people are going to rush through playing submissions so most people won't read your description.