Yeah it's awesome to see EAD doing this kind of stuff as well :D Although, like others already have said, I think that there's only a small team behind this effort; all they had to do was designing the courses.
But I'm not sure I'd buy this as a separate game though. Now I haven't actually played SM3DW, so I don't know how good these sections are, but they do look like fun! Just not $60 fun. Maybe $40. I also think this would have been a great DLC for SM3DW!
I'm on Twitter @DanneSandin!
Furthermore, I think VGChartz should add a "Like"-button.







