Because this is an , you will not find this on the Google Play Store. Google Play has strict policies against "scary games" that mimic system crashes or contain gore (which this game has in spades). Therefore, you must get the APK directly from GameJolt.
Depending on how many "souls" you save (or lose), the ending of the game shifts dramatically. The Android version includes the full suite of endings found in the PC build. gamejolt sonicexe spirits of hell round 2 android exclusive