Where to start with this...
I originally played this on a Powermac G5 when it first came out around the end of 2008, I remember that I originally got it sometime around the 2008 election. My attention was focused on this game the whole time.
It's one of those games where it seems extremely simple at first, but then the complexities and depth of it gradually shine through. The puzzles are neat, and I never had to use any skips until the last part (and I normally sucka t puzzles) but they don't feel easy, they feel satisfying regardless.
The visuals are nice, and they're crisp and good looking, and most importantly they do NOT resort to trying to look like pixel art. However, the game does run at a low resolution and there is no way to change it.
The soundtrack... Well, let's just say it's one of the best soundtracks in an Indie game ever produced. It is well performed, it is entirely originally composed, and it doesn't resort to sounding like chiptune or 16-bit stuff to try and manipulate nostalgic nerves. One of the best parts of the game for certain, and even better is that all of the soundtrack (the full versions, not the shortened versions in the game) can be found right on Youtube. Very memorable soundtrack, I can say that about very very few games.
Buy it? YES! It's on sale frequently anyways.