Ran into a crash on the Tutorial and New Game screens. Looks like this: 

Launched the game, clicked Tutorial or New Game, then clicked on either of the green buttons. 

Screen faded to black and I heard the sound play, but it didn't return to the title screen and I got this error: 

___________________________________________

############################################################################################

FATAL ERROR in

action number 1

of Create Event

for object obj_level:

Unable to find any instance for object index '112' name 'obj_mouse'

at gml_Object_obj_level_Create_0

############################################################################################

--------------------------------------------------------------------------------------------

stack frame is

gml_Object_obj_level_Create_0 (line -1)

Also when I click on the Back button it returns to the same screen.