I like the idea. The way it was done was clever, and good. The problem I have is that the sounds are really hard to distinguish from the music, as the music is way louder than the beeps. A visual indication of the beats would be nice, as it's easy to overtap or undertap (tapping not enough times) on beats, as you don't know how many times you have to tap CTRL or Space.
My rating: ★★★☆☆, because the product was well made, but the music was too loud and made the beeps hard to hear. This resulted into it being really difficult to time the taps right.