This was a really good special. Having the earth and Amphibia characters together for the battle was a nice way to mark the end of the series. The visuals were amazing, so were the twists and reveals. I think this part of the show has more sad moments than the previous two finales, as it has some touching and emotional parts all the way to the end.
What I really liked was that we got focus on all the characters and it didn't feel rushed at all. The plantars and even andrias got their own proper moments that felt right. It shed light on the past and lined with the present, making it all feel complete for the characters. We got andrias's resolve from his past that further fleshed him out from "true colors" and "the core and the king",thus finishing his arc, as well as giving other characters more growth.