First of all, I love the title. You've really brought everything together. The levels are fun, and I like the puzzle elements, in addition to levels that prioritize movement or action.
The last level with the dragon boss is very difficult. I think it's the amount of fireballs that are hurtling towards you that makes it feel almost impossible to beat. If you reduced that, and gave the boss a health bar, we would get some great feedback loops to enhance the gameplay!
- Kevin