Had a lot of fun developing some Halloween features for our minimalist voice diary app Pointo! It's sort of an experiment with seasonality.
If you're wondering, yes, it was quite a lot of work. And we (stupidly) we had the idea kind of last minute, so pulled off a mini-Hackathon this last weekend.
I'll update with news on what impact it had on the app stats!
You can check out the look and features here: https://play.google.com/store/apps/details?id=app.pointo