I can become the next Skrillex with this keyboard.
The idea is pretty cool, but the sound that emits from the keys is way too harsh sounding. The sine and triangle waves are not that bad, but the square and sawtooth waves almost give me a headache. I wish you were able to play more than one note at a time so you could make chords and stuff. A recording feature wouldn't be terribly bad either.
Overall, there's not too much I can do with this keyboard except.. tap keys, but other than that I think this is a pretty good game.

This is actually rather good, could use a bit of work here such as allowing bindable keys or some sort of shortcuts, but other than it's something that could be pretty useful. Not a bad submission in my opinion.

Outside of clicking on the notes, you can make use of the QWERTY keyboard. 2, 3, 5, 6, 7, 9 and 0 can be used [not the keypad] along with the letters Q, W, E, R, T, Y, U, I, O, P, S, D, G, H, J, Z, X, C, V, B, N and M. The letters and numbers are split between the black and white keys

It's nice to play around with especially if you're looking for a keyboard simulator to practice on. I'm not musically trained but have a somewhat decent ear. Compared to others I've experimented with this is more user friendly as you can go by what you hear as opposed to the actual notes.

Do play around with the duty cycles as they each have a unique sound and feel.