The test is purposefully made very hard, so excellent musicians rarely score above 80% correct.
That's for the text on the page.
I would add that the fellow who put it together is admittedly an "electronic music" aficionado, and his provided sample patches are stuck on only those kinds of sounds. In other words, many musicians might just achieve higher scores with the same note patterns played on instruments that they might have more familiarity with, horns, pianos, etc. As it is, there are a lot of harmonics involved with his chosen samples that are reminiscent to me of the greater difficulty involved when first attempting to transcribe Hammond Organ Jazz, where added partials and harmonics serve to disguise tonic centers at times. Anybody who ever "enjoyed" puttin' the needle back again and again on a Jimmy Smith recording knows what I mean here. *grin*
I am a resident in Radiology at Brigham and Women's Hospital. Before I started medical school, I had a career as a musician, composing several electronic music albums under my own name.
So don't take your results to heart, this "game" is worth what you paid for it.
Someone wishing to develop their musical ear should work on taking musical dictation, starting with the simple one-line short melodies and the key given, and work up from there.
Sofaggio - the old Do-Re-Mi, sight singing simple lines is still the quickest way I know to get there. Instrumentalists should learn to SING and/or whistle that which they play, not just expect the instrument to make the noise for them. Once you can sing it, you OWN it. Rinse, Repeat.
--Mac