Very cool game. I got very far in the game, with a very high level character with near maxed out firing speed, and bombs, it was very OP. but then the game went black and I saw this in the dev console:
gmlmessage: "Unable to find any instance for object index '84' name 'Core_Spawn'", gmllongMessage: "Unable to find any instance for object index '84' name 'Core_Spawn'", gmlstacktrace: (100) […], gmlscript: "", gmlline: -1, __yyIsGMLObject: true
maybe it is related?