OK, I managed to find a workaround. I am, sharing it here so that it will help someone.
I cleared the application cache and data to reset the camera. Just to go Settings > Application > Catan Universe. Once the data and cache are cleared, launch the game, you will have to relogin to the game, and create a new game. The camera angle is reset.
It seems that this bug only occurs in Android version of Catan Universe. I tested on iOS and I am always able to tilt the camera back and forth by using two fingers up and down.