Archived Kimimaru4000 video from YouTube. Original description mostly intact:

This is an unused video from Billy Hatcher and the Giant Egg titled "mv_boss_clear7.sfd". It's identical to the first part of the ending, except for the lack of audio.

The actual ending used is "mv_ending.sfd" and has this part baked into the start of it, along with audio. As a result, this video is not used.