So it seems we have end-game ready. Great, I like it, especially the many variants of winning and the many variants of blowing up the mothership.
As for heroes dying, I vote for them to be spared and I like the idea of after-victory part of the game, where you finally know for true what your odds are and who you fight with. The ability to export the winning army is also nice considering the multiplayer mode and the possible scenario mode.
Good work here. Cheers!