Oh, if the problem is just that there's still a border when scaling up on 1080p, then that's deliberate. It gives a little wiggle room, so the game can still scale up on slightly smaller screen sizes like 1680×1050 (which I had until very recently).
mae sense, just wondering: did you created 2 versions of same game, right? one is the low version while the second use the HD, it's possible that you had mixed them up?
That just affects the base size of the illustrations, not the size of the game. Just double-checked and they fullscreen identically for me, and the assets are right.
I actually like the border because it makes it look like an art piece on a wall, somehow it complements the art style and the overall feel of the game.
And a question: how do I download the art pack? I can't seem to find the option to download it.
Oh, silly me, I found the art pack :P