I love the colors and the overall mood of this entry. The music is a blast, and I had a lot of fun playing the game. Some of my considerations:
+ The movement and controls felt really good
+ The hit feedback was juicy!
+ The level design is good
- It would be awesome if it was possible to swim (maybe slowly) just holding the mouse button instead of clicking repeatedly.
- Some level elements were too similar to the health gems.
Great job!