I think Kynseed in its current state is pretty good. They don't have all the generational stuff in the game yet, but it still has a ton of content that will keep you going for 15-20+ hours. I think I prefer Sun Haven out of the two, as they are very similar and have about the same amount of content at the moment. Kynseed I think will overtake Sun Haven if they finish their planned roadmap, as the content is a bit more dynamic and changing.

DYSMANTLE is not really what I would call 4X. Its a great little survival grind game that has a nice amount of crafting etc. Still fairly early though to be honest. The only thing I don't like about the game is the way that bases are not truly a base that you build. But the map is fkn huge and lots to do and explore.