Nope. On Google Play I'm limited to a 50 MiB APK size so I can only ship assets for the "Cartoon" visual style. As you don't get the full experience of having both the "Cartoon" and "3D" visual styles available I find that not charging for the product is good option.

Also: my preconception was that Android users are more likely to pirate a product. So to prevent them from downloading a malware-laden pirate APK and getting a poor experience, I'd rather have them play the game for free without hassle and tarnishing my reputation.

That's an incredible attitude, and should be commended. I bought the game on Steam even though it's not really the type of game I usually play. I don't doubt I will get my money's worth.

I hope you enjoy the experience! To be honest I think Angeldust is a video game tailored for non-gamers. Most people playing Angeldust that I know in real life are not gamers by any stretch of the imagination, but they just like the laid-back pacing, welcoming nature and upbeat atmosphere of the game. It's amazing to see random friends and acquaintances with zero interest in gaming have fun in my game.

I've seen some games downloading assets after the application is started. Did you consider implementing it like that?

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.