I've posted a new build of Tetromino Stack (windows only for now) with two new features:

• Chill mode! Want to just build as high as you can at your leisure? No time pressure? Just you and a manageable amount of blocks?
• Color cycling blocks. There's two directions I want to go with block colors, this being the first. I suspect this might not be very friendly for some types of colorblindness, so in the future I'd like to implement colorblind mode(s).