Illustrations from Walt McDougall’s Good Stories for Children, 1902-05
I asked him to make up a list of sea creatures he'd like to play (having no idea if he meant natural sea fauna, or mermen and sea serpents, or what), while I did a quick re-skinning of +Chris McDowall's One-Page Edition of Into The Odd.
Here is the result:
Quick and dirty, but we were playing before the cereal got soggy, and that was good. Although, I think the kid would have appreciated more fights and treasure.