GameHow
The Sims 4: My Wedding StoriesLets you plan rehearsal dinners, customize ceremonies in Tartosa, and move Sims into a shared house with furniture.
Stardew ValleyAllows you to propose with a Mermaid's Pendant, hold a town wedding, and have your spouse help on your farm.
BitLifeUses text menus to choose rings, negotiate prenuptial agreements, pick honeymoons, and manage joint assets.
Coral IslandLets you court townsfolk or merfolk, upgrade your farmhouse, hold a wedding, and see post-marriage events.
LifeSimYou live married life day by day on a real 3D map, and your spouse talks and remembers in open text.