Another great Tower Defense game that was originally built as
a proof-of-concept for Internet Explorer 9 and now available in the Windows 8 Store is
Pirates Love Daisies.

This game is written using
HTML5 and JavaScript. Another great side benefit of the development of Pirates Love Daisies was the creation of the fantastic
EaselJS JavaScript framework.
EaselJS greatly simplifies working with rich graphics and the HTML5 Canvas element and is part of the larger
CreateJS Suite. A must for any HTML5 game development.