Someone asked me why your resources.assets.resS was absolutely huge but so compressible (they're slightly literate and noticed the oddity). I checked your resources, your textures are the problem. They're being stored as 64MB/32MB/16MB/8MB...etc textures. Check your import settings. Once you hit 4GB, Unity won't load your resources anymore (at least in the past). Breaks. You must address that. Your layers are your biggest problem. So many of them... So so many... And many of them are being imported and compressed into 24-bit-lossless.
Take disclaimer for example. It is 2359397B in size, 2.25MB despite the source being a simple 128.4 KB PNG. ...It is just a disclaimer, and you aren't using the alpha in the game, so why import that channel (BGRA)? And 24-bit color (RGB24) for that is just not necessary. Reimport *all* of your images and set their settings accordingly. Your biggest offenders are sooo many layers relating to portraits. Another example, ui/anatomy. Source is 146.9 kB but it is being compressed with channels BGRA and RGBA32...for a final size of 8.63MB. Check your compression/import. ...I'd also refactor the code, heavily.