For those that are confused: Arrows to move, X to shoot
You should probably have a short tutorial, even just text to explain that because I went through every key on my keyboard until I found the right button haha. I like the idea, but it does get boring after a while because nothing changes. You should implement power-ups for faster speed/stronger weapons/something and you should implement different enemy types or environmental effects. Overall, great idea, just needs a little more variety and it's all good :)