You must have SIP disabled for this application to work. Please disable it by booting your Mac into recovery mode, opening the Terminal and running:

csrutil disable

You may read more here: http://www.imore.com/el-capitan-system-integrity-protection-helps-keep-malware-away

1. Download WJoy here: https://www.dropbox.com/s/oowoqvnx091bcjx/WJoy%20Package.zip?dl=1
2. Move the wjoy.kext file to /Library/Extensions
3. In terminal, execute:

   sudo chmod -R +x /Library/Extensions/wjoy.kext
   sudo kextload wjoy.kext

4. Move the WJoy.app to /Applications
5. Turn on Bluetooth.
6. Start the WJoy application.
7. In the system tray, click the WJoy icon and click Begin Discovery.
8. Turn on the Wiimote or Wii U Pro Controller by pressing any key on it.
9. Press the sync button (red flat button on the controller) while in discovery mode.
10. Once connected, configure the Wii U Pro controller as a Steam controller in Steam Big Picture Mode. Read more here: https://www.howtogeek.com/234427/how-to-remap-buttons-on-your-steam-controller/

In my experience, Unity games for Mac do not support the Wii U Pro Controller, since they tend to use the XInput package. There is no application that emulates an Xbox controller for Mac.

Working:

• Binding of Isaac
• DolphinEmu
• Antichamber
• Hotline Miami
• Teleglitch

Not working:

• Ultimate Chicken Horse
• Gang Beasts
• Broforce
• Monaco
• Superhot