AAGS will be available through a few different storefronts, but will release first on itch.io.
itch.io supports Windows, Mac, and Linux. It also supports Android devices via sideloading.
You can also donate here for various physical extras, like stickers and magnets. Purchases on itch.io go to the developer (me) and support future game development.
These builds are censored by default, but a nudity patch (and uncensored Android build) is available.
itch.io purchases come with a Steam key.