I checked out the 6--1 branch, installed it on my D6-10 + CCK + filefield + imagefield on which I have a node type with 1 (multiple-) imagefield. The galleria style plugin comes up in the styles and when selecting it, the view is spitting out the right tpl code for this multiple imagefield.
So far so good but now I'm stuck with an issue. The main image with the pager is alright and uses the imagecache preset I selected in views, but the unordered list with the multiple images is not ok. The imagecache preset is not respected here and actually, I would like to use another preset for which I have not found any setting where I can set this.
Find attached a screenshot where you will see the unordered list with the way to big images and the main image below.