It sure is a change..

..From the usual submissions. Your style reminds me of David Firth's. I don't know why, but I liked it.

Well...

This is a piece of art.

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I'll jump straight to the area where you could improve, since it seems like that's what you're after:
x Smoother animation - I.E. eye blinks
x Even though the sketchy style made this submission more original, I think it would be better clean.
x A better story, if any even existed.
x At points where characters were speaking, even though it probably wouldn't be what they said/sang, it would be neat if it synced to the song
x General improvement with detail in the background

A good submission overall - Good luck with further projects :)

Awesome

This is the first time I've seen something this original in a dress-up. The art was neat, but the way the menu worked annoyed me. A few things that could be done to improve the game would be; more "cloth", making the sound disabling button stop the sound effects as well and a simpler menu.

4/5 & 7/10 from me

Meh..

I never understood why all these hentai galleries belong on Newgrounds, 4/10 to you for joking with it.

(Improvement for if it had been a real gallery)
More images
Better quality images
Warn people before screaming at them

Could become something bigger

The concept is similar to the "Rock band" game (Non-Flash), and has it's potential - Try adding more instruments and more control over the instruments.
If you have the skills and time you could turn it into something like "SC Guitar Maniac Dx 3"

Whuhu

Just What I need for my new (I was bored in 10 min.) flash :D !