Nice idea. I like the music as well as the option to choose a difficulty. Changing the cursor was pretty funny, but it was hard to click on some buttons. Especially on the small menu button. As mentioned although chaos is fun, it would help to have some sort of health bar as well as maybe indication of incoming projectiles. I died many times without even knowing from what exactly. Also it took me at least 5 deaths to figure out the controls :D
Still nice idea, but it needs a bit more.