There is some critical error with the save game system. It does not work at all when trying to load. (I tried this with a fresh unzipped file with no save and with one that has a save after day 1).
ERROR in action number 1
of Step Event0 for object obj_GenButton:
Variable obj_GenButton.Exists(104122, 3) not set before reading it.
at gml_Script_LoadThis@gml_RoomCC_room_Load_0_Create
############################################################################################
gml_Script_LoadThis@gml_RoomCC_room_Load_0_Create (line -1)
gml_Object_obj_GenButton_Step_0
And this error comes, when trying to hover over the auto button.
ERROR in action number 1
of Draw Event for object obj_load:
Push :: Execution Error - Variable Index [3] out of range [3] - -6.Exists(104122,3)
at gml_Object_obj_load_Draw_64
############################################################################################
gml_Object_obj_load_Draw_64 (line -1)
Also, the save game location is only in the game folder. That is not done anymore. You should use some user specific path or at least warn players, that this is so, so they can backup their save games.
I glanced at your changelog, and apparantly you changed location for whatever reason. Indie games like this, especially the ones that are still in development get deleted and redownloaded all the time with a new version. If you store save games only in the game folder, that is a recipe for disaster.
A note on the start screen how to quit the game and how to fullscreen the game would also be nice. Not everyone knows alt-enter.