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The game isn't launching for me, unfortunately. After installation, running Specter X-terminators.exe doesn't start the game -- it creates a background process named A GameMaker Game that's visible in Windows task manager, and that process appears to have loaded the game resources because it's using 192 MB of RAM, but the game itself doesn't launch.

Have you tried redownloading the program?  It may also be an issue with Gamemaker's instillation tool.