The Wolf and the environment are good animated. The music gives the game a nice atmosphere.
I can run the game without lags, but the game is really cpu/gpu comsuming, dunno what it is.
Getting hurt, will emtpy the whole energy bar. Sure, they're games, where you die immediately but I think it won't hurt to half the damage for some things you get. Just my personal opinion. Maybe implement another "mana pool" for the special attacks with other blue balls or whatever. It's a bit annoying, spending my precious health points for the abilities(that also empty the whole hp-bar with 1 use if I remember right).
So, overall, the first impression is good. Maybe yes, let the player choose for wasd or arrow keys.