Tower Blocks

This is a beautifully simple graphic test of spatial awareness and control reflexes.
Your aim is to pile up 30 blocks or more which needs a sharp eye and careful judgement.
To start the puzzle and to place each block, click or touch the screen or press Spacebar.

Courtesy of Steve Gardner. Sadly the coding has to make use of two javascript
libraries, three.min.js and TweenMax.min.js. Both files are included with this puzzle.