The core concept of stars flinging off like little sparks is real fun, but I concur with GoEatATowel. I'd also add that the single large star slowly moving into the head over and over feels contradictory.

I feel like it's a bit stiff, having the stars just burst out of the center of the Merc's head like that. Here are some suggestions:
1. Give the stars some falloff, like they're being launched from a cannon and have gravity.
2. Make sure the spawn point for these stars is either IN the hat area or spawns from a space around the hat so it doesn't outright look like stars are just clipping out of the neck
Other than that, this is pretty okay. Give it a bit more work, and you'll have a winner.