[RKDinOKC]

I've made it through one of the four worlds!
It had one code in an alien number system to figure out to unlock an area, but wasn't too hard. There is also a railway cart you get to drive around and blow some stuff up with a laser to be able to get around.

This second one is much more difficult to navigate and figure out the secret passageways. It is a lot of rock stairs and ledges kinda like a castle built into rock cliffs. Haven't been able to visualize where things are yet, only which way to go at different forks or platforms.