I would suggest downloading the trial version of Revo Uninstaller Pro. If the normal uninstall does not work, it has a "Forced Uninstall" option where you locate that main game executable file. Sometimes program installations do get corrupted; or, the developer did not want to have his/her program uninstalled. There is a 30-day free trial for the Pro version. Personally, I have the paid versions of Revo Uninstaller Pro on both of my computers. Few programs uninstall themselves completely.
I definitely concur with the "dire warnings" that you have received: it is bad news to just simply delete a program"s files and folders in the Windows environment. All kinds of registry entries could be left behind that could really bork your computer. As a part of Revo's uninstall routine, it always creates a restore point and a registry backup so that you can get back, providing that you have the Windows installation disks or have created a Windows Startup Repair disk.
If it was MY computer, I would do a full system image first to an external hard drive, with free imaging software such as Easeus Todo Backup Home Free or Macrium Reflect Free (listed in alphabetic order) (I own the paid versions of both and use them for alternate weekly backups of all of my partitions). Also ensure that you create their "Recovery" USBs/DVDs, so that you can boot your computer to run the program you select, and restore back, should something go wrong with a Revo "Forced Uninstall."
Caution is always WISE. The old saying is that: "Nothing forgets faster than a computer." The DELETE key is VERY powerful and can be irreversible is there is no backup.
Just my two cents. Have a great day ... and, good luck!