you should keep in mind that only the bad guy aliens were subtitled, chewie and other non-english speaking aliens were not. also, the story had plenty of humans around speaking english for the viewer to follow along. since it appears your film doesn't have any humans doing all the dialogue in english isn't a bad thing, with good voice actors think of it as simply being dubbed over. keep in mind that your film has a very alien visual style, if your target audience is primarily english speaking you'll be turning a lot of people off by having nothing for them to understand. i understand you want to use subtitles, but those would distract from the wonderful visuals you've created. i suggest using subtitles and the alien dialogue as an alternate language track.