UPGRADE 15 from CARNAGE OFFERING TD has just arrived!

New level 20 available which includes:

-1 new map with 2 portals to protect
-3 new music tracks
-10 enemies, including 3 new ones and 1 Boss
-A new Tesla Mark 4 turret
-Some towers and technologies not available for this level

Unit balancing, graphical optimization and interface improvements
Various bug fixes