Here is a complete walkthrough with all endings.
Choices are abbreviated to avoid spoilers. Other than choices with hearts and specific choices marked in bold below, you can make any choices you want. There are only small variations, but you’re free to save & reload to see them.
- Every time S…
- A user, fuel…
- Start a new game
- Dissuade Luna…
- 2 people
- Cannot be done
- My death…
- Save, then choose Stop…
- Start a new game and don’t click Exit when the option appears
- Load the save and choose Continue…
- Someone was…
- The user…
Who can put an end to everything, and save everyone?
- Luna->End 1
- Cecilia->End 2
- Myself->End 0
(That’s also my recommended order for seeing the endings.)
Note that since making an incorrect choice will remove that option from the list, you can only purposely kill yourself on choices with three or more options, unless you’ve purposely gotten yourself down to one heart before. (But since there aren’t unique game overs for each choice, there’s really no reason to do that.)
The choice with the correct answer “A user, fuel…” seems to be bugged and will give you a game over if you get an incorrect answer with 2 lives left.
Guessing S’s identity wrong will take all your lives.