Because this is a manual APK (not available on the Google Play Store due to content policies), follow these steps to ensure a clean installation:
Do not install this over version 0.19.x or earlier. Those saves are incompatible and will cause a cascade of script errors. Summertime Saga 0.20.16 APK Change Log for Android
This is the most critical section for mobile users. Version 0.20.16 includes: Because this is a manual APK (not available
Version 0.20.16 is not about new story content. Instead, it represents the final bug-squashing and optimization release following the massive 0.20.0 rewrite. For Android users, this APK is the most stable, memory-efficient, and save-game-safe version prior to the upcoming "Candy & Tech" update. If you experienced crashes, black screens, or save corruption in earlier 0.20.x builds, this is the definitive fix. Do not install this over version 0