He's right. I myself use Grammarly a lot. I've learned English through the "brute way", but now it's flowing fine. My game had an uptime with that site help as well as I had.I don't use discord but maybe it is a good idea to write the dialogue in a google docs file and let Grammarly check it that should already help with many of the things that stood out to me.
I like how the story is moving from a place to another pretty fast, by the way. But even so, well explained. Just polishing some things here and there and it will be shining diamond-like.