Hey there playing around with this little tool and it works fine with the provided elixir png.
Tried a couple of other images just for the fun but all of them have the text offset and overlapping. I made them in correct size and scaling as described. Also the color is just always blue.
As said the elixir example works perfectly, so everything seems to be setup corret.
Could it be that the exif information are needed in a certain way so Imagineer can loads the image correct?
While saving the png with gimp I recognized that there are basically no metadata information but the elixir example has quite a lot.
Here is and example png that I tried.

Any idea or hints?