This project is no longer maintained since Heroku shut down its free tier.
For a static version of the game that works (but does not support rating levels or submitting custom levels), see: https://github.com/maksverver/duokoban-static
To install node_modules:
npm install
To run locally:
# Note: this uses the production database!
export DATABASE_URL=$(heroku config:get DATABASE_URL)?ssl=true
node server.js