You didn't mention any thing about it in your first comment so I was just making sure, no need to be rude just trying to help.
Also if you're still having trouble you can just leave both doors close and all you have to do is use the plush a lot more often, then you don't have to worry about Sammy, Poppi, Nile, and/or the shark girl killing you and you can focus on repairing, waiting on Nile's heart to fill up, and getting the gallery stuff in between using the plush.
That's how I beat it anyway.
P.S. None of this is to say the RNG is fair or good, the entire point of this strategy is to avoid most of the RNG issues.