Tick module for the game
Do  you  really  need  a  comment  above  every  line? There are a few good comments like # Function to retrieve current timestamp, hopefully using window.performance object, but comments like # Indicates if module is running are really not useful. They add no value to the code itself, and can be removed. Preferably, you should only be using comments when parts of the code are unclear.

Secondly, your function alias raf is fairly unclear. I'd recommend renaming it to something like requestFrame. Also, if you're creating aliases for functions like this, I'd also recommend creating one for window.cancelAnimationFrame, and other functions like this.

Finally, I'd recommend renaming tick to something like tickLoop, like how it's described in the comment above it.