The actual game effectively reached alpha over the weekend. The pieces have real art (though I expect I'll tweak it some more) and the difficulty progresses over time (filling the progress bar increases the gameplay speed and adds more colors over time). Game Over is in place but isn't handled prettily yet.
I also added the ability to swipe down on the screen to drop a piece instantly, which currently causes a pre-existing collision bug to rear its ugly head in a very obvious fashion. That's actually awesome, as I couldn't get the problem to happen reliably before. So, next stop will be revising some of the collision behavior, then after that onto menus and other home-stretch activities.