When his turn comes, he could swim back to the ground and continue the game? That's the big difference, you can't kill 200hp worm with a plop, that worm would still have i.e. 156 hp left when he swims back to the ground in his next turn... And if it's not his turn, they could shoot at him too while he's floating on the water..
Am I fantasizing too much? That's too complicated?
worms don't stay between turns when TestStuff is disabled. That's a hardcoded limitation, and bypassing it will require lots of unnecessary tricks, hacks, and whatever, resulting in loss of features.
Btw, with the oxygen points he would die at some point when they end
I can also add a "hp reduction" when the oxygen points reach zero.
Another idea: the "invincibility" weapon (as from
my set) would also give the unlimited oxygen until next turn