Check your log file @ ~/Library/Logs/Unity/Player.log
Click Finder in the Dock (bottom tray of apps, the first item on the left) to make Finder active, then in the menu bar (where you find in the Apple logo in the top-left corner), click on the menu item "Go", then at the bottom of that click "Go To Folder...", enter in
~/Library/Logs/Unity/Player.log
in the dialog, click Go, and open Player.log