I don't think it is made clear enough what the window parameter is and that the 1.5m are an example for it.

This case is for the intructory example. Below you have
``

Three conditions must be met for a valid experiment:
Float parameter "h" in meters must be greater than 0
Float parameter "bounce" must be greater than 0 and less than 1
Float parameter "window" must be less than h.

if you're checking only for spacebar space, why not to check only for ascii uppercase instead of losing possible rest of uppercase chars

also nth(0) is next()

Came here to say this.