Thank you for the reply azagaya.
Here is the original image with transparency.
Righ-click > Save image as... (if you're on windows) should work fine with downloading the image.
And please take your time. :)
Like I said, the results look pretty good right now too, but if the pixelation is maintained fully, that'd be just super. Appreciate your effort to look into it, regardless of the outcome.
Thanks again!