Liminal Yearning is a solo journaling game about wandering in a dreamstate. It also contains kissing.
The PDF is 10 pages, with a nice, textured, easy-to-read layout.
Gameplay is a guided series of questions, which you write in response to. The questions are very specific and follow a set story, so the feeling is almost closer to a guided meditation than a game.
It's a very quick read, but it's sweet in nature and a nice concept.
Overall, if you're looking for the feeling of romance from a solo game, this definitely delivers that. It's neither especially mechanics-y nor narrative-y, but it *is* nice.