There is hentai of the mobile game ad.
The world is healing.
Finished the game. It's cute.
When you get the black screen bug/crash on stage 7-7, just keep rebooting the game until you get fed up, then start changing the screensize with 1, and then eventually one of the times it'll actually load what it's supposed to. The solution might have been dying so there was a cutscene for it to load. Once it loads the stage restart correctly once, it won't break there again. That's what I did, at least.