the timeScale property was added in V-Play version 1.5.1 (see the docs here where this is noted), which is exclusive for Pro customers and will be available to Free users with about 2 months delay. You may already have heard of the anniversary sale we currently are offering to get 30% off the Pro license until December 24th: http://v-play.net/2013/12/1st-anniversary-sale-v-play-recap-and-future-announcement/
For non-physics based games like the Squaby tower defense game, you can create a new property e.g. timeMultiplier and multiply it with all time-related properties in your game. In case of Squaby, that would be for example the movement speed of the squabies, the tower fire rate, etc.