Fun original idea
It's a great idea, but it should build up much more. I get used to the noise quickly and I would've liked it if I kept being challenged the whole way through. I bet you could make it at least twice as mean in the end.
Why do you call it Unicorns? CREEPY STUFF! Well... yeah, why do you call it Unicorns?
Please contact me if you would like to use this in a project. We can discuss the details.