A single player, open-world pirate RPG game where choices matter.
A truly open-world, free-roam Star Wars game where you can travel around a fully-explorable vast universe (generated like in Space Engine) doing whatever the fuck you want.
An open-world hard sci-fi game with heavy focus on diplomacy, politics, trade, colonization, science & technology, terraforming of planets, etc. Preferably based on The Expanse, or just something similar.
A historically accurate game about preparing for and embarking on expeditions. Polar expeditions, Africa, Asia, etc. A mix of survival + sailing/traveling + making discoveries.
A single-player game set in pre-Colombian Americas, with historically accurate representation of nations/tribes. Heavy focus on politics, trade, culture.
A racing driver simulator where you start from grassroots motorsports as a kid, and move up the career ladder through various racing series.
Similar to above, an immersive first-person football player simulator game where you start in youth academy as a kid and try to make it to the top, and including detailed events both on and off the pitch. Something similar to the concept in I am Playr, which was a brilliant idea.
A proper game based on LOST TV series. So many possibilities there.
More couch co-op narrative-driven adventure games with a well-written story.