Every great thing has it's flaws
don't get me wrong, this is extremely wonderful artwork and an extremely good game. my only problem was the difficulty moving up the ladder. i tried the game multiple times to see if there was a difference(which there was), but I noticed something from each retry. the difficulty remains the same, so much in terms as when you first begin, the differences should be almost subtle but just good enough for a novice to notice, then advance by making it less noticable(like a dot blemish on a building...). each level I played remained the same difficulty just with more differences, just tone it down at least on the first two levels and then go full blast into the third.
last but not least, the hint circle threw me for a loop, when it showed the first time(after about my 3-4th retry) when trying to find the difference, it was outside the circle, or maybe in between the extra lines surrounding it, either case, i could have sworn the designated difference was outside the circle, considering that was the last one i needed. unfortunately i only experienced that one time, so don't go crazy.
anyways, it's an awesome game, and is truly worth noting an extremly good puzzle. I hope to see more of what you have in store.