It is maybe intentional but Mars gravity 1.5 really does not look anything like real Mars which has lot less gravity then earth. Also keen Mars has less gravity as well. Problem with high gravity is that no flying vehicle from shop really work there, which limits your options. Personally I would like it switch gravity with Alien planet or something in some future versions but we will see.
Somehow Mars and Alien planets have swapped their moons ( Europa vs. Titan ). Then again real Europa is actually Jupiter moon so it probably does not matter. Whatever it is, things are confused here.