OK, got it!
First we will need to reconfigure the map and the code for the fact that you have more LEDs.
In your pattern code, change:
var matrixCols = 8
to the number of columns in your matrix.
var matrixCols = 32
In your map, set
width = 32
Also be sure that your settings tab has the total pixels at 255 (edit: should be 256).
Ok - let’s start with that and see what the pattern looks like!