Dig it... the graphics, the gameplay, the frenetic pace of the music that speeds up with the passing of each wave.
Would be great to see a couple things: when Elite (bigger) Wolves die, make them explode into a star of light that briefly illuminates the whole screen?
Also, again dig the music, but can you please add separate volume control for sound/music? That would be SUPER great. The music tends to blast over the game's sounds (as well as any content running simultaneously in browser windows, such as youtube, movies or news). Thanks!