Theme hasn't been announced that I can see.
Here's something I'm using these for:
Not exactly, I just used a part of her attack & death animation to make it look like she's jumping.
Haha I figured you'd get a kick out of seeing her in action. She even has her own song now. Let me know if you publish any more boss sprites - I'll definitely buy them!
If you're curious on how I'm using it, check her out:
This is such a cool asset. I'd love if you made more bosses that are "abominations" or lovecraftian style.