That is pretty cool. I just did a git clone, read the code and ran the example. I have no connection with the Neo4j developers (I don't know any of them), but I must say I like their business model: AGPL license use for free, and if you want a commercial license it is a little expensive but affordable if you really need a commercial license.
Cool you like it! Next up (when I get time) is a full OpenStreetMap importer writeup, so you can run deep algos on a real dataset. Have tested routes with depths around 1000 in under 1s :)