I feel like it's better fit to a mobile device. I'd be more interested there, personally.

There are 3 achievements with 0% in global statistics - Hero (beat all levels in world 5) - Prince (beat all levels in world 6) -Hexplorer (beat all 80 levels) While no one might not have played all 80 levels (although I doubt it) 3.8% have beaten all levels in world 7 and have the ach 'beaten the game' so the first 2 are definitely broken. Please check out and fix problem....

I find it incredibly hard to read from the level select screen whether a level has been completed. They just all look the same. It always takes me quite some time before noticing that levels I haven't completed are white/black in color. Some visual (and not color) indications of completion status is very important when every level consists of two complementary colors. The completion is currently denoted by its hue, which is not a very obvious feature....