The Android version is 12 Gigabytes.
There is no smaller version for Android, but I think there used to be several versions ago a lower quality images version for Android, which was smaller but since even that got bigger than 4 GB even that could no longer be installed on Android as normal Android APK.
Honestly, if the game was split into multiple parts on Android, I would accept it. All it would need is once you start the "part 2" you input the trait number amount each girl was at in the previous part. Once you put in the main hotel girl's stats, you can hit start, enter your character's name, and begin part 2. And so on if needed. It can be three 4GB files or four 3GB files.
