The black left eye is due to mobile HDR being on. Disabling it fixes the problem.
You should be able to remove the controls, just retry with the latest UE4 version.
Nevertheless, I’m experiencing some issue with the cursor on the GearVR, it renders weirdly. Plus, the example project needs a few optimisations if you need to run it on mobile (e.g. remove the sky, using only static lighting, simplifying post processing and so on)