I played a two player game of In This World yesterday and had a great time making some bizarre worlds around the theme of space exploration. This game will immediately go into my shortlist of games for introducing new people to the types of games I like or for times I want to do a little worldbuilding.
I played it without knowing what the steps of the game looked like until we got there, but the gears in my brain immediately started the moment we were making the 'true and obvious' statements. Knowing that we'd be changing those statements later in the game, I started planning ahead with statements like "astrophysics works the same everywhere."
The world generation part follows up on those statements in such a great way. Starting each world with the very simple prompt of "choose one thing to make different and up to 2 to keep the same" lead to some fascinating variety among the four worlds we made once we fleshed it out completely.
I really like how little time you spend in the worlds you build in this game, it takes some of the creative pressure off and allows you to just let the weird ideas win the day. I'm looking forward to playing again some time and seeing the worlds that come out of different starting concepts.