To play you must be a registered user on the database you are connecting to.
For the public database you can register at http://schemaverse.com.
This also assumes you have registered with Heroku (http://www.heroku.com) and you have downloaded their Heroku Toolbelt (https://toolbelt.herokuapp.com)
Usage (Deployed to Heroku):
git clone git://github.com/func-i/ruby-schemaverse.git ruby-schemaverse
cd ruby-schemaverse
heroku create
heroku config:add SCHEMAVERSE_USERNAME=<username>
heroku config:add DATABASE_URL=postgres://<username>:<password>@db.schemaverse.com/schemaverse
git push heroku master
heroku ps:scale worker=1