Great news, in May, a new version of Tile2map go out (0.7.3) with save the map on the website into a public domain database of map you can use for your game.
With this new option, you will able to test your map with the map explorer and a also a Tower Defense game.
A template system to create map for the tower defense will be active to ensure the compatibility of the custom map.
With the great popularity of the chromeos version, a new version will come not long after.
Also the line option is add in this version and some modification in the tool selection.
See you soon