okay. I think the reason why a lot of developers don't include downloads for Android phones is that the size of the game needs to be small enough to run. As far as I know, unless you're got a really good job and can afford a phone that can run vn games with a bigger file size people aren't going to have a phone that can run a vn with a bigger size.
On top of that, it requires more resources/programming/time/money etc. It's not as simple as just resizing the resources, because going from the size for a PC or laptop to the size for a phone screen, can affect the quality of them unless you know how to do it without it affecting the quality.
So art resources would have to be redone in a smaller size.
Don't quote me 100% but as far as I know, it would be basically making two games instead of one even though it's the same game.
So a lot of developers don't do phone versions of their vn games because it would be double the cost and what they have planned for their game might not work or be too large for most Android phones.
However, you have given me something to think about for my own projects to consider.