Not bad at all!
This was a decent introduction to from the sounds of it, potentially a new series. In my opinion this could pass as a Children's Television Theme song. There was also some humour in this as well, for some reason I found the Unicorn with the smiley face on the side of his head that turns angry at the last second, just comical especially since he was playing the guitar. The graphics were very nice too, I liked your animation style but it looked like you could have more actual movements instead of just lip syncing.
I hope you can get unlazy and finish an actual episode of it. I'll be looking for it!