A near total rewrite.

* Five new towers - Moon, Poison, Rocket, Tesla and Sun - for eight in total
* Five enemy types, including armoured units and bosses
* 5 chapters of 4 levels on a trail map, each with its own palette
* Towers unlock just before the enemy each one counters
* Breakable obstacles that pay gold and free a build tile
* Sell towers, set targeting, control speed, call waves early
* Sound and music synthesised on device
* English, Traditional and Simplified Chinese
