oh! you know, i think that's an error on my end. when i made this game back in 2014, i messed with the script for the save and load menus. so the only way to load a save is from the main menu.
so sorry about that! i'll fix it and make separate "save" and "load" buttons for the in-game menu. i'll update with the bug fix ASAP! thank you very much for bringing this to my attention! C: sorry again!