I know you've said that GameMaker files tend to get falsely flagged as malware, but my antivirus found some very real threats after I downloaded this game: PornTool adware that kept duplicating itself until this game was quarantined.
Now maybe I don't understand how malware works, but from what I researched, I think you've got yourself an infected file in that download.
Quick Update: Both downloads (meaning the one on Game Jolt) have this malware. Currently suffering from the consequences of fucking around and finding out.