Good to know that you enjoyed the quest! It’s actually built with Meteor and one of the tasks is quite related to Meteor transport system - I bet you’ll find it as you progress through the story )
Regarding technical side, it’s built with React, SVG and CSS animation - simple and performant due to hardware acceleration.
We didn’t intend to use any specific technologies or nice graphics initially. It just happened to become something very nice when our frontend team got truly inspired and unlocked their true potential.