Simply open index.html up in a browser and you can use the arrow keys to move the player. When you reach the top with the player he'll respawn at the bottom to start again.
I'm using npm to manage dependencies (which really only amount to build/TDD tools)
You can run gulp test to run the unit tests.
You can run gulp tdd to continuously run unit tests when project files change.
Students should use this rubric for self-checking their submission.
For detailed instructions on how to get started, check out this guide.