I enjoy the game so much, but can the story start get a bit more...happy? Android existential crisis, traumatic childhoods, missing slaves.
It already has.
The way I write stories is like a roller coaster. If you hop on a ride, you don't want it to be level, that's not very enjoyable. That would just be a train. For a story to be interesting, there needs to be highs and lows. Android had her arc of existential crisis, and it was overcome in v0.14. In v0.15, she received some wholesome content, and it won't go back to anything sad or depressing for a while.
Many of this is just my opinion of course, but yes, Android had some wholesome content in v0.15, and she will get more wholesome story in v0.16 as well.
One thing you can be certain of in my stories; things will change, nothing will remain the same forever.