I like the scaling fantasy with this one, and the health being a currency is a nice design choice! Also very nice visual effects!
My critiques:
I went off the map (at least the background visuals), needs a world border.
The game gets boring quickly. The movement is slow, and the enemies don't seem to be different other than visually / just increasing in health. Same thing with the auras, they're just different sizes to me and I don't see how they're unique to each other, at least not visually.