Fascinating conceit, although that alone hardly makes for a good game. Not a huge fan of Hudson but still, this is intriguing. At first it seems like just an aesthetic decision which wouldn't really affect the gameplay dynamics, but thinking about it more the possibilities open up. They could have levels where the sun is setting and the shadows grow taller, or a place with artificial lighting or where maybe the light source moves, so the platforms change. It's also an interesting rendition of 2D gaming, making it in a 3D environment but casting it on a 2D plane within that environment. I'll probably check this game out, at the very least. I always admire a company's willingness to do something different.