I'm also liking those clouds!
1 and 2 are readable, but not very pleasant because of the garish colours. Like MysteryMeat said, though, that can be an effective part of your worldbuilding if done purposefully.
3 and 4 have some contrast issues, and in motion it might not always be immediately clear where you can go.
4 in particular feels like a dev test level, rather than an intentional design.
I also want to add, I like what you're doing with the camera movement and screenshake! I'd reduce the screenshake a little personally, though. Ideally, you should provide users with a slider in the options to control the amount 0-100% (you can just scale the camera motion by that amount, should be fairly easy to code).