[ItsFirefly]

I considered it, then dropped it. The Google Play Store definitely has a mechanism of adding more data/bundles to your application, but (when I investigated this) you'd need to drag in Google-provided libraries and tie your app to the Google Play Store. I dislike lock-in and do my best to be able to independently develop and distribute my product. So expansion files/bundles didn't look interesting.

To compensate, the Itch.io Android APK is actually pretty much identical to the Google Play Store version, but it just includes all 3D assets too.