@Cortizol
Hi, this is a common problem for Mac games. Right click on the app > show package contents > MacOS
Then open terminal. Type
chmod +x
Then drag the files of the MacOS folder (usually one file, sometimes 2) into Terminal and press enter. You should have ran:
chmod +x /path/to/game/MacOS/game file
This makes the core game executable, and it should now work.
If it doesn't, Apple is quarantining it because it's from an unknown developer. To solve this, go to that MacOS folder again, open terminal and type then drag to make:
xattr -dr com.apple.quarantine /path/to/game/MacOS/game file
Run the command and it should work fine.
Hope this helps!