@adriweb:
1) Yes, I think the problem is at enable/disable elements on-the-fly, I use that function to sort out items, that needs a crafting table.
2) I'm using this tool: http://hoffa.zzl.org/index.php and it looks like this compresses the images as much as possible
3) Without any saves the .tns is 29KB. Every save takes about 1-2KB. Btw every world is 200x100 Blocks large (but the code supports larger).

@ben_g:
Yes I used the original textures and for the other questions just look at the first post

Where did you get your textures(I've looked but could never find them)?

Suggestion: You start with nothing.

@Augs: Whoops, forgot that... Of course you'll start with nothing, those items were only for debugging! Sorry for that!
@AlexisVieira: Well thats a shame, have you tried switching the graphics mode with [V]? What device do you use? On my CX with OS 3.2 there's nearly no delay on processing of a keystroke.

Same here.

I didn't have time to play this, but could anyone remind me of what is the difference between both graphics mode? Is the texture resolution lower on one of them, for example?

Ah I see. Thanks for the clarification. I guess it won't impact the visuals much, though, since the important part are the terrain graphics not looking like Atari 2600 material.

First, congratulations, I just tested and it is great.
Really, well done

I have some feedback about the coding, though :
You may want to take a look at what you can do with some more advanced lua coding techniques, for example :
- http://inspired-lua.org/index.php/2013/05/a-new-smarter-way-to-create-a-screen-manager/
- http://inspired-lua.org/index.php/2013/05/how-to-add-your-own-functions-to-gc/

It can greatly simplify your code