Obviously, you're not going to get "infinite hours of gameplay" out of it the way you can with DF, but it can be a fun ride for hundreds of hours.
There's also a very active subreddit at r/RimWorld
You want Warhammer 40K in Rimworld? Got it.
You want Lovecraftian horrors in Rimworld? Got it.
You want different types of cats, or barbed wire, or typewriters? Got it.
Literally. There's no z-levels, which really kills it for me in a post-apocalyptic sim where you can't dig a defensive moat or put riflemen in towers.
I’ve been playing the hell out of RimWorld over the past few weeks. It really is a great entry to the kind of game DF is. The creator did a really good job of designing mechanisms to hold your hand in the beginning. The warnings on the right hand side of the screen were a godsend for me picking up RimWorld to make sure that my housekeeping was in enough shape to keep exploring without having an entire colony wipe for some ridiculous reason. It’s made me ready to try to tackle DF again after successfully running colonies in RimWorld.
I suspect someone can mod DF to give the same kind of gentler entry experience (if they haven’t already).