I liked the concept of collecting items to reduce your own health regeneration, and I liked that the goal was to avoid the enemies rather than strictly defeat them. My favorite power-up was the "block rain" one.
Not sure if it's an issue with my browser, but I wasn't able to attack when I clicked on the screen, even after collecting the attack power.
Also, it was a bit challenging but it looks like it would be easier if I gained exp and upgraded my character.