Firefight of Anihilation

An RTS video game played comonly by Hyperion Federation people.  The player faction fought against a terrifying interstellar parasite and built a machine that was hoped to save them - a time machine. Completed just before the anihlation of their race, they quickly got as many on board the time machine starship as possible, and then used it. During the first use of the time machine, though, a strange anomaly happens. They dont end upon their homeworld in the past, but in a different, strange place. This world seems to be infinitely large. There are a lot of primitive inhabitants who fight the time machine ship wherever it lands. But as the time machine requires so much power to use, the ship had to do an emergency landing.  The starship, having not brought any miltary equipment form their prime, was forced to adapt at the hands of an incomming invasion. They also needed to prepare quickly, and so they gathered whatever materials they could from the strange world and fought the primitive soldiers with primitive weapons. As the player defeats enemy forces, he must advance technologically as well and not fall behind the natives. In this game, there are many eras of technology they have to get through ranging from spears to sci fi weaponry such as plasma cannons. However, the time machine will recharge before they reach the information era. At this point, they can chose to do the 'final firefight' where the player and enemies are reset to the primitive times, a battle starts, and both sides advance technologically during the battle. It will get harder to defeat the enemies as time goes on, but while this is hapening the time machine is charging. The longer the player can defend the time machine, the further into the future it goes.  After the battle, the time machine activates and goes into the future. It captures a unit from the future, but must go back to the past else it risks running out of energy. The game starts again, but this time the player gets a single, all powerful unit from the age the time travel reached. This repeats, but these units taken from the future are kept by the player even during time travel.