I've downloaded the Windows build and the error still occurs, only I get this log:
___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of Step Event0
for object oPlayer:
Push :: Execution Error - Variable Index [0,6] out of range [1,6] - -1.cycle(100040,6)
at gml_Script_CycleCostumes
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Script_CycleCostumes (line -1)
gml_Script_PlayerMove
gml_Object_oPlayer_Step_0
The classic index out of range error, I'm not sure why this appears to be on just my PC, and because of that it's probably not your fault!
I hope no one else gets this, I can see your game placing highly!