I actually expected it to sell this much given the internet advertising and heavy word of mouth. Still, I'm happy to see it sell this well. Now I just hope it'll sell at least 200,000 (more like 300,000-500,000) in America to encourage Vanillaware to make a sequel. Seeing as how its coming out in 2 1/2 months in Europe, that should help too.
It looks good for this 'niche' game.