I loved the game and it really fit the theme. However, I use game maker too and I know how annoying the errors are, I got one during mid game, ill paste it now :)
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FATAL ERROR in
action number 1
of Step Event0
for object oSpider:
Unable to find any instance for object index '100107' name '<undefined>'
at gml_Script_splitLineByPoint
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stack frame is
gml_Script_splitLineByPoint (line 0)
gml_Script_spiderConnectString
gml_Object_oSpider_Step_0