While I like the idea that all the rows are connected, I am not gonna lie that I was disappointed that you could not also move things vertically :P
That was a design choice. It reduce the number of possibilities to something that a player can manage. It's already 3125 possibles combinations, making it varied, mostly possible and tricky enough. Letting any block move anywhere would reduce the puzzle potential by a lot. But I might try to see what kind of gameplay it can bring. I'm not really positive about it being better.