Eagerly awaited this one and the antics didn't disappoint between Celestia and Luna with the sisterly competition between them. The overall story has a great premise and it is good to see the older castle opposed to the new one. It really feels like since the mane6 retrieved the elements of harmony the old castle just doesn't exist anymore.
I did find a few errors such as Johnson's smile where his teeth overlap his lips instead of going behind them. Also when Luna is dangling there I found some errors, but it was good that her..I guess chest plate stayed in place.
Loved the ending with Luna getting revenge using the companion cube. Might have done things a "tiny" bit differently where it showed Celestia staring a Luna with the little princess having a sheepish grin. Celestia would have several holes in her hair from the turrets that shot at her. Twilight was a nice touch bouncing around with Johnson talking about the repulsion gel.
Definitely can't wait to see some revenge with Twilight.