Biggest issue, escape should not end the game...
Edit: was looking for options, hint there isn't an option screen ingame.
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FATAL ERROR in
action number 1
of Step Event2
for object oUnit:
Variable <unknown_object>.<unknown variable>(100331, -2147483648) not set before reading it.
at gml_Object_oUnit_Step_2
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stack frame is
gml_Object_oUnit_Step_2 (line -1)