Rikifive

Oh yes, it should look better- and I hope it will.  

Everfree Forest may contain caves / underground passages, but this is still subject to change. For now I made some of the most important (basic) graphics for that location to help me visualize it better. I haven't got into actual level design yet, so I'll be planning the layout of the whole Everfree Forest soon.

Also I think of these more as locations, rather than levels, as it will be kind of an open world, where you will be able to travel between locations pretty much whenever you want, unless restricted by story event. Where you'll have to go will be told by story/objectives, but you can go there sooner or later. With that being said, some locations may require being visited more than once, pretty much just like in the show.

Backtracking can actually be an excellent part of gaming, sometimes, especially if the environments are interesting and eye-catching, or if changes related to the story have happened to the areas you're backtracking through.  Metroid Prime 3 comes to mind, especially Elysium.  (I hope you've played that game so you'll know what I'm talking about!)

Heh I haven't played any Metroid game, which I suppose is kinda a shame. Never owned these games, so I guess I've missed some stuff. I keep hearing about these games and I have a basic idea what it is about.

So I'm not getting the reference, but I can imagine what you mean. I think I've played games, that had something similar, though I can't think of any from the top of my head right now.