It works better, the enemies and boss are visible now. The intro voiceover seems to work now as well. Some issues that still persist are alpha borders around the objects and at the edges of their rectangles. For example, they clouds have very noticeable white vertical lines at the edges. Adding some padding to the atlas and checking the import settings should solve the issue.
I think the boss spends too much time in general buried. I would have preferred to get a good look at it, because it's a really neat design. Maybe the burying mechanic could be the boss disappearing and then pouncing in from a different direction?