it's quite nice, I have a couple of comments anyway.
Why only 2 columns? you have plenty of space for even 4 if you want or 3 if you do not want too much but as it is now it seems it's a lot of space wasted.
When hovering a link the tile becomes really dark and it's impossible to read, I don't like that.
It would be better IMHO if hovering cell would show the description instead of hovering the links. This would keep consistency because other way it feels... funny, can't really explain why...
But nice anyway good job.
