Either the command line tools you need aren’t installed or they are not properly installed. You can check that by entering the following command in the Terminal window:
xcode-select -p
If it is installed, you should see this:
/Library/Developer/CommandLineTools
If not, run the following command to try to force an install via the command line in the terminal:
xcode-select --install
That should spawn a dialog box asking you to install the Xcode command line tools. Click Install and then try the commands I mentioned in the original post again.
OK, so I went and found the exact version of Xcode needed for my computer, and the Command Line Tools on apple.com.
Neither was installed, and neither could be installed automatically. Had to do that manually. I'll let you read the error that resulted, yourself: 
I then replaced the existing signature, as before. Nada. The app loads, then the game window (all black) shrinks and it crashes within 2 seconds. I checked the directory location above inside the Xcode package contents as well as where I installed the Command Line Tools in the Library folder, earlier. Both locations have the codesign_allocate Unix executable file. It's there (66k).
Same error as before.
Here's a screenshot of the SIGSEGV error:
I still think it's a GPU problem.
Thanks for what you've done, so far.
--RB
Just to stand in solidarity with my fellow macOS buddies -- I normally use a computer running macOS 12, and both Dangeresque & Hide n' Seek run perfectly on that computer. However, when I saw this, I just wanted to do some checkin', so I used a computer running 10.10.5, and it told me I needed a computer that was AT LEAST running 10.13. So that's a for-sure-- macOS 10.8 would be too old, so that specification info can be changed on Steam. However, when I tried running both Dangeresque & Hide n' Seek on a computer running 10.13.6, I experienced this same force-quitting issue.
Opening it up in the Terminal seems to confirm your suspicions that there's some GPU issues: https://www.skyetheguy.com/dangerfxsque.txt
-- On the other hand, on all three macOS devices tested, the WEB version of Halloween Hide n' Seek works perfectly. So, there's that. Not like it would be feasible to have people load this game online, but maybe that's indicative of it not being a lost cause.
