Interesting. I think the monotony of the game and the inevitability of how each day brings you closer is what really draws the player in. What I wasn't quite as charmed about was the incredibly slow pace of the game. I understand that the permanence of the player's decisions and the slow pacing are supposed to make the player's decisions sink in, but it also makes the game kind of boring. The music was the only thing that kept my interest as I continued to play.
Since I originally saw PewDiePie's Let's Play of this game, I admit my perspective of this game may be a little tainted since I already had seen one of the endings. I tried skipping work as much as possible and then going to work on the last day to see if I could work on the last day and fail (I did). Of course, since I don't really care about human or animal life on the planet, it's unsurprising that I took a more unconventional route through the game.
Ultimately I think this game is really neat, and has the same depth as a lot of these types of games. However, I skipped work twice and never got to see how the protagonist actually spent his time when he skipped it. I got my days mixed up and forgot to take Molly to the park on the penultimate day, but somehow I doubt I'd have seen much of a visual of them playing together if I had. The lack of a narrative in the decisions the player makes takes away from the gravity of the decisions you make.
Still, a good experimental game.