Interesting take on the backstory. Those are real fireballs as show up in the boss, by the way. At one point when i was working on getting the goblins along the side to toss them at Bro, I tried turning them to ridged bodies. Sis's fireballs suddenly had gravity physics, and that wasn't any good for the cutscene.
We actually had sprites for the house (seen in-game as a brown rectangle) and goblin camp drawn up and implemented on the last Friday of the jam, but that commit didn't make it into the submission. Here is what it would have looked like:
This screenshot actually comes from a branch where I have overhauled most of Bro's code for walking, and doesn't have the screen pan for the boss yet, though I intend to aim for more of a fixed-camera for the fight per my original vision.