Oh, no, I didn't.
The site has a small mushroom at the top right corner which upon clicking displays the list of Flash animations and their songs in a pop-up window. It's barely noticeable when you focus on the animation itself, and it
is your first time visiting the site.
Nonetheless, the song is called "Men in Green", and is by
Maktone, my favourite chiptunist. Check the site out.. His music is great.
EDIT: I just listened to the song you linked me to.. Sounds pretty similar..!