Nice idea

Have to say this is a one of a kind of game the sound is good the function from key to sound could be faster and more playing options aswell a fun concept here, I like the idea and the art and animation was notbad.

~~SUGGESTED IDEAS~~
As suggested

~X~

This is cute, but I kinda wish you could play the notes a bit faster.

¬_¬ No

Just......No.....

Hmmm

Nice, only a little pity for the misstyped 6 which became a 5, however cute :p (5 because it's quiet easy and not a real game)

If I played guitar...

I would probably use this. if it responded faster you could use it easily.