Cool spot. From a filmmaking perspective, you could improve this by offering more "reveal."
The helix shot your drone performed is designed as a "reveal" style of film shot. Therefore, the real payoff is in the big landscape view which you didn't really capture. You got some of it near the end, but would be much more interesting if you designed the shot so it captured a lot more of the unique landscape (water/horizon/sky in thirds, for instance).
Also agree that normal speed is the proper playback because of the water movement.