Puff

Bloop pack critter: a blueberry koosh ball covered in soft rubber spikes that go pale at the tips, with googly eyes, rosy cheeks and pouty lips. It bobs in the air breathing slowly; every few seconds it holds its breath and puffs right up like a pufferfish, spikes standing stiff, then lets go and zips round like a balloon. A tap puffs it up. Raymarched in WebGL, six palettes.