Intelmission is primarily a long conversation, with an introductory segment.
You and another spy are captured together and have to talk. The game features many many topics, and makes you aware at the end of how many you explored. You can choose what to discuss, or allow the game to choose for you after a certain time.
In a way, this game reminded me of Mirror and Queen. Both are conversational games with a ton of work behind-scenes to provide many topics and allow for user flexibility. But in both games, that flexibility gets communicated to the user more as mirroring what you choose rather than gaining new information. There were few surprises, narrative twists and turns.
I did enjoy this one though, and Mirror and Queen.