Hey there, really enjoyed your little game.
Unfortunately I get an error on one of the later levels:
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FATAL ERROR in
action number 1
of Create Event
for object obj_panel:
Variable obj_platform.obj_name(100038, -2147483648) not set before reading it.
at gml_Object_obj_panel_Create_0
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stack frame is
gml_Object_obj_panel_Create_0 (line -1)