As a preface, I've seen this game played by Austin Ramsay's excellent actual play Beam Saber: The Cenotaph, and while that was years ago and my memories are pretty fuzzy, I really liked it. It was made for the Emotional Mecha Jam, which produced all sorts of excellent sad games about mechs, some more of which will be coming up some time in the future.
Mech Bay is a two-player game about a mech pilot and an engineer, and a night they spend fixing the pilot's mech in the middle of a war. It's one of those oneshot style games that is meant to take place midway through what could be a longer narrative, where you generate the history between the two characters on the fly as you play, and I always love that, it's my preferred way to do oneshots.
Speaking of which, it has a bunch of great tables to roll on (another thing I love) to help you determine various aspects of your history, which I've rolled on to give an example: Wrench the Engineer and Jet the Pilot are star-crossed soulmates (ooh), and Jet just barely survived a crushing defeat. Soon, he'll have to face the Iridian Empire (there's some light worldbuilding going on here) in a hopeless last stand.
As you can see, this provides some really juicy narrative threads. After that, you play three minigames that guide you into doing a little hurt/comfort story: First, you talk about the past in a way that hurts each other, and also describe the way the mech's been damaged. Then, you try to make amends while repairing the mech, and finally, there's a sort of denouement with the fixed and upgraded mech. Each minigame has a series of questions to help guide the scene and flesh out the world, and the final game's questions in particular are all very cute and are definitely aimed in a romantic or at least intimate direction, tinged bittersweet of course with what you know the pilot's going to have to face the next morning.
All in all, great, concise little game for telling a sad and sweet story with a friend.