How to reach Secret Ending 1: 

In your house, open the closet in your bedroom. 
Look at the shoes. Whether you move the shoes under your bed to turn off crush content or not doesn't matter. 
In your Kitchen look in the cupboards. Take the crackers from the cupboards but do not Use them. 
Go back into your room. You can use the crackers in your room to put them by your shoes, anywhere else and you will eat the crackers. 
Upon leaving your house you will receive the Sewing Needle item. 
Proceed to the Campus > Science Building > Chemistry Lab
Taste the Purple Vial to shrink. 
Pick the Sewing Needle back up. 
Attempt to return to the neighborhood. Without the sewing needle your character will refuse to try, with the sewing needle they will make the attempt. 
Follow the path, scene should trigger automatically.