As it was mentioned in a previous review, the controls are somewhat awkward. The pieces slowly hover left and right, resulting in hard drops that occasionally don't go where you intended them to. The color/block settings are pretty neat but it'd also be nice to have some sort of background settings.
In its current state, this game probably would have been quite good about 3 or 4 years ago. But now, if you're on a Mac and if "falling-blocks" games are your thing, you're probably going to stick with something Mac-like and polished like Quinn.
Cubes does have Windows support though, so there's definitely potential here if enough work goes into improving the game itself.