slow down time

[1micha.elok]

Code:

include "polyline.n7"
...

' Game speed.
while not keydown(KEY_ESCAPE)
    ' Delta time, low cap at 15 fps.
    ' Slow down by pressing spacebar.
    ' Multiply delta time with gameSpeed.
    ' Time to spawn a new ship?
    ' Update ships.
    ' Update stars.   
    ' Draw.
wend

Awesome ! I've never seen before on how to code "slow motion effect" in a game ... 
I used to play text games in "super real slow motion" and  "super slow dot matrix printer" back then in 1980s