Only on 3rd try i didn't stuck on first wave, and met the crab king. Really nice looking boss, but i think you should rework him a bit. Because green blob on his back looks more like some "megaheal". If you change blob's color to red (violet for the rest of body is ok), that'll change the perception of him as a last boss, responsible for the Marine Apocalypse. And shouldn't the boss with name "Crab King" be 2 times bigger? Also, for now crab overlays shrimps, walking above them, instead of pushing the crowd of shrimps away