Well Done
The plot is attention-grabbing. Either character development or action is constantly happening at any given time to keep the viewer interested. The only flaw is that it's a bit on the short side. Although short, the constant action makes up for it.
The music was great. It clearly matched the video and was made the focus of the audio rather than the sound effects, with sound effects still being audible in a few key parts. The action in the visuals matched the audio well.
The graphics were terrific. The animation quality of this flash is among the best ever submitted to Newgrounds. All parts of the animation were smooth. There did not seem to be any animation errors. Character animation was amazing, Aquanna flowed like a body of water and Sparker blazed like a fire.
Overall, very well done. One of the best submissions in quite a while.