pokpokpok also suggested this. I created a branch where you can try it out yourselves!

  git clone git@github.com:themadcreator/seen.git
  cd seen
  git checkout vary-heights
  npm install
  npm run site

then nav your browser to http://localhost:5000/demo-2048.html

it looks like this: http://snag.gy/RdOtD.jpg