LOL, it took me 10,000 retries to kill the thoracic cavity, I didn't think the fight would go on. I won't try to win the game then but I think the fight is superbly designed which is the reason why I insisted in trying to defeat the cavity (one time my last bullets put it down to 0% after I died), I love everything about it, I love the progressive difficulty, the speed and spread of the bones is perfect, the size and speed of the wave too and I really like that at some point the wave doesn't propagate as far as it used to. Besides being funny and cool the size of the slime is fun to manage, it's perfect that it interacts with the border of the screen to limit your movement while of course also not affecting your hitbox or it would be terrible.
Great one!