So far so good
This demo is cool. The control keys aren't very intuitive but it's easy to get used to them (also, I saw a "controls" screen, maybe they can be changed from there). Also, it's cool that if you're firing left and move right, you don't begin firing right but move backwards instead, which allows you to keep killing the bad guy.
There are only 2 things I disliked:
1) There's no quality control, and the game performance is a bit laggy.
2) This demo ends too soon! Please continue it if you can, it looks like a very nice project.
BTW, in case you continue it, how do you plan to make it fit Newgrounds? Maybe you have to change the image format, for example to vector image, or PNG with less colors. Or use an external page (or, if the game succeeds, maybe you can ask NG to allow you to submit a bigger file)