Simple. I would have kept blasters and such large scale. Captial ships only. That means all the guns would be various types of slug throwers. The most advance slug thrower would use an electro-thermic reaction to propel the bullet. If you ever saw Alien Ressurection that would be the visual effect I would use. Personal blasters would be fairly powerful and might make an appearance towards the end of the game as they would be rare and expensive.
Also I would take the time frame involved and change teh light saber as well. There wouldn't be light saber double blade in the game whatsoever. I would aslo keep the light sabers, being new weapons, rare. At this time various regular bladed swords such as vibroblades and monoblades would be used.
I would also remove personal energy shields as they were in the game, but actually have equipable metal shields that have charged plating.
I would keep the starships and such as they are.