I would like to start this out by saying I am an aspiring writer and I have messed with flash and other programs used to create games, so I know its tough and time consuming to create even the smallest of works of art.
With that being said there is a lot of potential for this flash work and if your going to stick it in the game section you should take into consideration your target audience. Games should be a little more in-gauging, story should really be more catching and draw a player in to enjoy the development of a character, this "visual novel" felt it would be better suited as a squeal rather then a stand alone or however you have it set up.
Now on to good points. Really enjoyed the music and the art is decant if could use a little polishing. If you have any friend that are good with art give them a character design and have them help you or see if the veterans on newgrounds would lend you a hand. As Fubaka suggested take a look at what other artist are doing and learn from them. Especially ones that have a lot of titles and majority a 3 star or higher. Good day and hope to see more work from you.