A few people wished for it, so here it is! A spoiler-free walkthrough for all the endings.

I've written down the correct choices with no context.
And "whatever" if the choice doesn't affect the ending in question.

HALVED END:
- whatever
- whatever
- "Tell yourself to shut up."
- "Merge back."
- whatever
- "Something healthy."
- "Stay"
- whatever
- whatever
- "Don't merge."

MERGE END:
- whatever
- whatever
- "Tell yourself to shut up."
- "Merge back."
- whatever
- "Something healthy."
- "Stay."
- whatever
- whatever
- "Merge."

COUPLE END:
- whatever
- whatever
- "Agree with yourself."
- "Stay like this."
- "Be kind to yourself."
- "Sweets and treats."
- "Go home."
- "Think about it."
- if capsule is blue: "A hand in marriage."
- "Trick the bastard." ("I want to merge back!!" in v1.4 and below)

BAD END:
(this is really just a dead-end for the couple route, that's why it's marked as a +1 and not really considered an ending):
- whatever
- whatever
- "Agree with yourself."
- "Stay like this."
- "Be kind to yourself."
- "Sweets and treats."
- "Go home."
- "Think about it."
- if capsule is blue: "A hand in marriage."
- "Claim the contract is invalid." ("Our contract is invalid." in v1.4 and below)

Thanks for playing!!