Thanks everyone for answering so quickly, that's dedication. I have a suggestion, though it's quite minor.

The Slide event (which is amazing to finally see work, I remember posting in 2006 or something about it being broken) should have a parameter to designate the sliding distance (in tiles, or something). I almost didn't notice it at first, because the distance was quite small.

Also, what happened to the preview with vertical flipping? I won't mention the one with the numbers 1-9, since I suppose that wasn't official.