Focus Go is the gallery I always wanted to have, so I built it. I don't like bloated galleries with 23093485 features, so I only built the ones I need/think are needed.
Galleries are a big canvas to showcase your pictures/cat gifs/videos on a chronological order, from new to old, nothing else.
You click the picture, it loads up in a fancy animation, and voilá full screen with touch controls.