I believe the final battle should have a larger number of aliens as well as more variety. I believe that the first stage of the mars assault should not only include sectoids and cyberdiscs, but floaters and reapers. Also, for the base in mars, I believe that it should have all aliens and terror units present in the game: sectoids, floaters, snakemen, ethereals, mutons, cyberdiscs, reapers, chryssalids, sectopods, celatids, and silacoids.