Nice discovery and the shutter speed of this camera app is really very fast but it is still not good enough for low light photography.
Also the icon is different on the multitask window and on the app drawer.
The UI is much better though I will send the feedback about low light capture.
Also if you use the shortcut gesture that is double tap of power button for camera app it sometimes open and sometimes doesn't.
Try when the screen is locked for sometime repeatedly.
It shows something like Camera error Can't connect to Camera.