Difference

[Hordolur]

Hello,
So I got Zombasite and so far it is very good game, but I am wondering
What the difference between this and Din's Curse and Depths Peril?

So far it seems the 3 games are about the same? or am I missing something?
Granded I am only level 4 on Zombasite and never got past level 10 on the other two

I never got into Drox Operative and I loved Kivi's Underworld, I have completed twice now, sorta wish it was on steam with Achievements I would get again and play for them.