If you've gone through the hole in the wall behind the crate in the storage room, you should encounter Lilian, the witch, in a hallway. After talking with her, she should disappear, and you can progress (moving upward through the hall).
You should find yourself in a very small room with drawers and closets, and a dress in the middle. Looking around should uncover a pair of gloves in one of the drawers.
Once you take them, leave the room and the house. Investigate the well covered in moss, and you should now have a new option to rub away the moss while wearing the gloves.
Entering the well will transport you. Have a look around the map; you'll find an area you are able to progress through that was not available to you before. Lilian should appear to talk with you again. She'll tell you to find her, and though the direction is vague, you'll want to head towards the house.
Thank you so much! I'm sorry for such a late response — but I really appreciate your comment! The tileset is an edited version of the original provided one, so I cannot take much credit beyond altering them, of course.
I'm finally working on putting up a walkthrough file, too!
