So, I didn't think to read this until after the jam, go figure. My game actually plays in a 640x640 window (I thought I read somewhere that we could upscale the resolution, as long as we also upscaled the "pixels"). So, my game still "thinks" in terms of a 64x64 grid, but then my renderer blows that up to 640x640, just to make things look bigger.. I think that's within the rules. If it's not, then oops :-S