With all the preparations out of the way, we can start working on the boss fight. We will first create a new sprite to work with. In the following paragraphs, we will add functionality to this sprite to make it a worthy boss.
We only need to add one new sprite for the boss. Let's choose an interesting creature that's obviously different from the starfish we used already. It should still fit the watery theme of this game.
Gobo, the new Scratch mascot, is a good candidate. He looks somewhat like a sea creature and is very recognizable: