Cool game! I like the idea of the spinning but for some reason the UI and at times also the direction of the weapon seemed to be severely misaligned with where it shot. The gun almost never shot in the direction it pointed. Not sure what the issue there was. (Played on Firefox)
Other than that. Graphics were slick and controls felt nice. A handful of waves in I did start to feel a bit bored and would have wanted something to change up the pace if the game was to be expected to continue much beyond that.
But overall i liked my stay.