I really like the way the game looks and feels. The controls are clean and the main character's animations are lively. The environments are also lush and attractive. The music is rousing and fun.
The decision to give the player an innate healing ability is really interesting. That said, 3 seconds is a long time to stand still--I was rarely able to make practical use of it during combat.
The main thing that's missing from this game is enemies. The boss fights are well orchestrated, but I was disappointed when the second boss fight was the same as the first. Enemies would have been a great opportunity to give the game even more personality.
FYI: I also used the WebGL and I had no issues.