Usually, the first episode is shorter. I also prefer it that way, so things can be more polished first. You can also focus more to get rid of major bugs in case there's any. With larger release for first episode, there are more works for debugging in case there are any bugs. (I also support this decision because I don't have 3ds so I can't join S/M hype...)
But if you insist to add more content to the first episode, what content are you planning to add? A few more sidequest, a side-story, or an extension of the major plot? If it is the former, then I'd really like to wait because I like more sidequests. However, if you plan to extend the major plot, make sure to do it right so the episode won't end abruptly.
Remember also that this month Sun/Moon is released and Reborn might be released around if not this month so you should have that in mind if you want more attention to your game~ Anyway good luck with the project, I'm looking forward for it. Also, that light looks nice~