I like the variety of areas, and the water terrain with the affected physics is cool. The dash-jump gives for interesting moves, and the wall jump is very intuitive. The music is good, it fits the action and it's cool that each area has its own identifiable tune. The change in tiles is enough to portray the idea of a different area and keeps the sense of exploration awake. The movement is very fluid.
The animations and lighting look really cool and the 3d is well worked in this game. The theme fits well, though it would have been interesting to see it affect the gameplay in some other way.