I've replayed a bit more to do more endings, and I think I've spotted two mistakes in wording/spelling (though you may want to check it with a native english speaker). First one is when the main character tells the kid they don't have to be ennemies and all that stuff. It says "we can help each others", but I'm pretty sure it should be "each other". The other one is in the Ending 5, when the MC says the kid found them. It says "And now I know that I was lucky that he did" - I don't think it's a mistake per se, but the first "them" isn't necessary - "And now I know I was lucky that he did" seems more natural.
Other than than that, I actually have a question so...
SPOILERS (I guess?)
I did some more endings, and I got a variation to the true ending where the MC isn't human or human-like. After that, I've checked the walkthrough out of curiosity about that, and it says "Most of the pictures are variation of the same ones, based on who(or what) you are and what the creature is" - I get it that the MC can be man or woman and human(-like) or not, but can the kid's appearance vary depending on your choices? It looks like it from what it says in the walkthrough, but I didn't get to see it in the game and I'm curious.