The file is located in /storage/emulated/0/Android/data/com.turner.ppg/files/PPGSaveData.txt. It consists of one line of text in the format:
VAR1:VALUE1:TYPE1;VAR2:VALUE2:TYPE2;VAR3:VALUE3:TYPE3;...;VARn:VALUEn:TYPEn
There are the following types:
B - Boolean - Values: T = true, F = false F - Float I - Integer L - Longint
Savegame values start with S0. S1 or S2 for the 3 savegame slots.