You play as an electrical surge being "transmitted" across a set of connected nodes.
Use the mouse to click on neighbouring nodes to move to them. You win a level if you arrive at every node exactly as many times as is necessary to decrease their value to 0. Travelling to a node that is already at 0 will lose the game, as will travelling through any other dangers. If you get stuck in a dead end or want to restart, the 'r' key allows you to restart any level from scratch.
The code consists of an executable with an associated data folder. Simply unzip them into the same folder and run the executable.