I think it's perfectly normal to shoot ice out of a hot exploding cannon and create a glacier in an entire Caribbean lagoon, don't you?Seems to me that it was the same in potco, once you got a critical mass of ice it would persist for more than one full wave and you could do as your screenshot shows. Never knew whether it was a bug or intentional.
I'm thinking rapid fire exploding Penguins would be desirable ammo. However, tlopo may receive letters from the animal rights people.
Is there grapeshot? Disabling ship sails could be a more realistic tactic fighting these ships.
Not that reality is all that much as fun as shooting ice pop treats at bad guys.