I think you've got an interesting demo here. The foundation for everything, story, gameplay and characters are good, but you've got a lot that needs to be improved. Even for a demo, it feels very incomplete, and there's a lot of bugs. I know a month is not a long time, but I would have hoped for a little more polish.
I'll start with the pros! Your story is fun, and the cutscenes are really nicely done! Thanks for using my shocked expression generator pieces by the way!! I would have appreciated getting a mention in the credits for my art though ^^'''
The battle retry option is a really great idea. The item and skill descriptions are fun too.
So for the cons/bugs;
There's quite a lot of typos. Some are just grammar, and others are really hilarious misspellings such as Mrs. Gulry calling Oden a 'sweatheart'.
After leaving the prison, the BGS drips isn't told to stop, and so can be heard throughout the rest of the game.
The mapping needs work. I'd recommend asking for some advice on the forums. Personally, I think they're all just way bigger than they need to be. You can get away with this for the exterior, but the interior maps could really do with shrinking. You've got a few tiling errors too where you've just layered things a little weird and it doesn't look great.
Some of the events just don't work. In the prison it seems like your guards are saying two lines at once, and most of the choices seem to be broken, such as trying to pray in the church or read the crazy chicken mans diary, it doesn't do anything. You also need to be consistent about whether or not your npcs should have stepping animations or not, it's kind of strange when only half of them do.
https://imgur.com/wViLsqb The namebox and direction fix needs changing here.
https://imgur.com/a/gcC61 Passability error.
https://imgur.com/a/P92Ht You need to turn off direction fix here, as he's always facing forward no matter which way he walks. Also, he can block door, and I had to quit the game since he wouldn't leave. To fix this, use Yanfly's Region Restrictions and create a region that blocks events from walking in front of all of the doors. This will also help stop the horses from walking out of the stables.
My advice would probably be to shrink and focus on details instead of making such a big world, that, for this part of the story, isn't really necessary. The maps are so big and easy to get lost in that it took me 43 mins, although I felt like there was only 20 mins of story. I don't know what the purpose of the disgusting liquid in the prison was, the mysterious parchment and code in the fireplace or even how to free Jonny. I defeated the guard and bought White Coffee, but didn't know how to distract him.
If you can get all of this sorted, I think you'll really have a great start for this story you're planning! It's got obvious potential, but the lack of polish is going to put people off. With IGMC over, hopefully you'll have an easier time. Keep up the good work! :D