I really like the world of Horizon zero dawn and forbidden west. All the ruins from buildings we can recognize (and some we cannot) are really cool. I also like how humanity had to start again without all the knowledge that was lost in the Apollo purge and how they had to adapt to a world shaped by the AI called Gaia and her robots.
I find that it’s pretty good, but I paid for premium so I don’t know if the basic version is as good.
What I like most, is that you can practice the language you are learning with example scenarios, and get feedback from other users.
You also get stars for doing lessons and giving feedback to other users, which with the streak helps me do the lessons regularly. (There is a leaderboard too but I just ignore it.)