The language text for the aliens, if possible put some ancient Egyptian hieroglyphs on the ships, kinda like the ones they find on the real alien ships here on earth. The wording can be in any language in the known imagination for smoking up, but on the ships, chuck on some of them a little hieroglyphs characters as like they do in RL.
Also, imagine the game making 3 phases. Phase 1 on earth, phase 2 on the moon, and finally Phase 3 on Mars.
So the game as it stands just needs to complete the story line to reach the moon, where the fight is with the Aliens at their base. for location on the moon, use those from the deleted pictures from Nasa, give a taste of reality mixed with the game, and that would complete phase 1 and then phase 2, the fight has been take from earth to the moon, and now the fight has been completed on the moon, and now we need to take the final battle to their bases on mars.
When you start operation on the moon, its not a hunt in the sense your after the space craft and alien landings, no... your going after each of their bases, their supply bases, their launching bases, their living quarters, their hospitals, and their factory bases for replacement ships. Once all of these bases are destroyed and cleared, and as well looted... the knowledge is shared about the incidents involving the launch point to the Moon bases from Mars, and that is where the beginning of phase 3 takes place.
As the Mars phase kicks off, you need to once again, start the fight swinging, the newly established Mars base has just landed, troops have been armed, and supplies, as well, eager to fight. The Mars aliens are well aware of the capabilities of the invaders. This time, these bases are heavily loaded with aliens, the usual landing craft will be taxed to the limit entering the underground bases one by one. Clearing the aliens as they spot them going down each level into the harbor of these hostile buggers... Once complete, the knowledge of the Alien Home world becomes available, and will leave open a sequel to the game environment.
UFO: Humanity Fights Back In the sequel phase 1, the base is on the surface of their home world, planet covered with incredibly artistic and symetrically shaped cities, some even looking like concentric rings of a pond as viewed from the map. The focus this time is to destroy their launching facilities, and destroy the command and control. Only to find through the missions and research, that the governments back on earth have been working with the aliens for years, in this instance, to find the entire alien war was a decoy to hide the real invasion. The insertion of humanoid aliens on earth, to live among us and blend in, all this while the aliens re-design a system of control implants for humans, as the governments of the world attempt to work against the program the aliens have been hard at work changing their tactics.
The battles on their home world, bring you back to earth in phase 2 of the sequel, this time your fighting the humanoid aliens on earth that have made residence among the regular military. The fight on the Alien Home world is abandoned after the completion of the surgical strike missions to a majority of their tactical facilities, to include the manufacturing, engineering, birthing experimentation, and finally command and control. Now back on earth, its a fight from base to base clearing out the inserted hybrid humans on earth, with heat sensitive goggles on each troop you can identify and eliminate each alien soldier mixed in among the regular humans. Base by base encounter eliminating the scum of these aliens, the team researches to find that the alien leaders on earth are hiding among the leaders of the world in the government buildings, who also control the implants that many Humans have received at the base of their spine from the abductions secretly carried out with governmental consent for years.
Now for phase 3, the final fight, from one major nations capital to another the fight continues into each government facility clearing out the alien leaders hiding among the capitals of those nations involved. Their influence must be cleared, thankfully, your teams have had plenty of practice. The weapons have been tested in battle on multiple planets, and the bubble gum has run out. Unfortunately... the alien leaders have saved the best equipment for themselves. Personal shields, guided human seeking missiles, as well mind control, and the unavoidable take over of the innocent civilians as fodder to run into the path of the fighters. From your base now on earth, only after clearing all the military bases, and finished identifying and eliminating the aliens that have been inserted, this is it, the final push, each cleared government building is one push closer to the end. Can you complete the missions in time, the aliens have planted explosives at each capital, if they alien leaders are not cleared out, they will detonate the capitals as punishment for loosing control. Can you pull it off in time?
Oh yeah... I would LOVE to help write some of the story line.
If you would let me. =)
Respectfully,
H0Z3R