That's a basic "Snake" game written in ClojureScript. To run install Leiningen and then run make.

It will tell you to open http://localhost:3449/ in the browser. Do that.

Change src/snake/core.cljs when figwheel is running and observe it being immediately executed by browser (immediate means it takes 0.1-0.3s to compile and then loads new code in your browser without changing state). Source maps are enabled so you're all set.

There is also advanced compilation configured, so you can do make www and it will put optimized version inside of www directory (be patient, it can take half a minute depending on your machine).

There is also an article describing whole setup.