To use this game with Minetest, insert this repository as /games/minetest_defense in the Minetest Engine.
The Minetest Engine can be found in: https://github.com/minetest/minetest/
Minetest Defense is based on minetest_game 0.4.11, and should be compatible with Minetest 0.4.11.
Most of the default minetest_game files are untouched. License of these files is in LICENSE.txt.
License of the defense mod, the regeneration mod, is in mods/<modname>/README.txt