Understandable. Also, I'd be lying if I said I had that kind of space on my phone anyway. I bought an SD card but I can only use that to store shit on, but not install apps.
step 1. Download Joiplay.
step 2. download entire game, and store it in a folder on your SD card.
step 3. double click game launcher.
step 4. play and have fun!
i find the general performance with it and other games when on my SD, is similar to my 4gb ram laptop (old laptop from 2013. runs skyrim with 25 fps with billions of mods. can get up past 50 in less busy, or smaller areas. ran f04 at like 15-20 fps. same as fonv + fo3 lol!). and so are load times. my phone has 8gb ram. and a decent gpu. if i remember right.
only warning. some games absolutely tank. probably due to hardware incompatibilities or something. although. thats the exception. not the rule. this games fairly smooth 80% of the time. with some studdering. and very rarely(usually when opening menus, especially save menu). it freezes for like 2-3 seconds.
rpgm and ren'py games seem to lagg needlessly on both though. still havent discovered why.