Thats not a site issue. That is a game dev issue. Or more accurately, a YOU issue. I am an android user, but I also know how much more effort it is to make a Renpy game into an android version. You have to install the android SDK, configure it, set it up in renpy, build the game out, test it in an emulator (this can be a LOOOOOT of work), then fix stuff, which prob breaks stuff in the main game, so fix that, re-build it, then publish the changes. And you have to do that EVERY time. So feeling that you are due an android version is... a little much. For mac/linux/pc, you literally just check those boxes.
Want Windows? check the box.
Want Linux? Check the box.
Want Mac? Check the box.
Want Android? Here is a link to instructions. Read it, download stuff, install it, read how to use it, configure it, link it to renpy, build (and wait, its a looooong process), then spin up an emulator, test, fix, test, fix, etc etc etc, build, done.
Other 3 OSs? 2s each. Android? At least a few hours unless your game is SUPER basic and everything goes well and you already have the stuff installed.
Either way, this has nothing to do with the site. The site does not make these games. It just provides users (uploaders, visitors, etc) a place to post it so you can find it easier. If you want to complain about missing android versions, contact the devs on their patreon, etc, or via direct message if they posted their own game. The fact that you are asking for it and someone is providing it for you means that user went through a lot of effort to unpack the win/lin version of the game, load it up in the renpy dev kit, and do all those steps above so they could upload it for you.