I really like the artstyle and controls, sadly I only got to the 3. Level and encountered this error when going into the next room. Keep it up :)
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ERROR in action number 1
of Step Event0 for object oTransition:
Moving to next room after the last room.
at gml_Object_oTransition_Step_0
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gml_Object_oTransition_Step_0 (line -1)