Hey,
I'm on my second run now and I'm again/still enjoying it very much.

I was in the Fish Cave yesterday and while singing to the fishes, they started to die. I needed quite some time to realise that it was because of the urchin costume.

Anyway, when I realised it, I changed costumes but got barely enough red fish left to activate the stone...
I'm against making them invincible, but wanted to ask if they respawn if you leave the map and reenter (had no savegame near enough to test it) because otherwise some players may accidently lose the chance to get fish form.