It is available on mobile BUT I encourage you to get the PC version on Steam because the mobile one doesn’t include the pretty decent voice acting
That’s odd; I was sure that I played some of this on Android with voice acting, so I searched my records and discovered that I also got it from Humble Bundle. I just downloaded and installed it to check, and aside from a warning that it was written for an older version of Android, it seems to be working fine, full voice acting included. There’s an option to turn it off, but it was on by default for me.
Maybe there was an issue with your specific device?