No instructions. Had to figure out z to push and x to shoot on my own. It reminds me a lot of those older Atari games. Pretty sure that is what you wanted to do and it works. I would have the controls shows on screen before pressing continue.
Was it not on the game page? Scroll down and there's instructions. Perhaps I should move it to the top so people could see it. Also I agree, in-game instructions would be preferable than having it on the page.