I deactivated a recently installed gallery plugin that sucked and I installed and activated your plug in. It looks very exciting if it really works that way!
However, it doesn't seem to be working for me. I created a new page "test responsive gallery," chose Gallery Template in the page attributes, and inserted a few photos into the main content area. Here is the link to the test page:
I don't remember the gallery template looking this way when I first installed WordPress. Maybe a theme is interfering with the plug in?
This is what I see when making the page:
Please help! I will gladly donate if this plugin really works as advertised.