Wow, very nice update ! Good work

What should I implement next?

A readme ?
Maybe even an ingame readme in case people forgot which was the key to do some specific action.

I didn't follow development but the fact that you pulled off a textured voxel engine (even though without lighting) at a pretty decent speed is quite impressive.

I find lighting rather annoying. And what's the difference between a "voxel engine" and 3D triangles? AFAIK a voxel engine is optimized for different sizes of voxels and has a better storage and rendering algorithm (most of the time with octrees).

That looks really awesome! This is the first time I tried it on a real calc, and the speed is really decent. 
I think it's a little weird that it says "loading" when exiting, though.

I didn't want to make a second "Saving" image.. But I'll fix that when fonts are working!

Indeed. When I tried the program I had to search through a dozen of pages of replies just to find the controls and I still felt I missed some.

A readme ? 
Maybe even an ingame readme in case people forgot which was the key to do some specific action

Umm, README.md has been there since v0.7.2.
A ingame readme would be nice, but I'd have to add font rendering first.

New feature release: v0.8!
New features:
- Crafti now uses block data (8 bits per block), which means your save files won't be compatible
- Torches in all directions (even upside-down)!
- Flowers!
- Mushrooms!
- Spider webs!
- Cake!
- Faster chunk culling!
- Ability to load external textures ("/documents/ndless/crafti.ppm.tns") in PPM format (24bit binary)
- A splash screen (From the internet, I only added the text "crafti")!
- Message "Loading" now shown when crafti is doing some heavy processing
- Disabled the mode with textures disabled, it was too ugly and slowed down the startup somewhat

Bugs fixed:
- Clock on screen

Known issues:
- With HD textures the block selection menu becomes unusable (but 1 and 3 still work)
- Front side of blocks is fixed (all furnaces face the XY-Plane)
- CLIP_PLANE too close
- Can rotate more than 90° horizontally, which turns the screen upside-down
(I'll probably fix all of them in v0.8.1, but that'll likely take a while)

Screenshots (BTW, hd textures don't make the game slower  ):
     
     

What should I implement next?

And BTW, I'd be very glad if anyone could design a better menu or "Loading" message for me, I suck at art 

My goodness, that looks fantastic!

My goodness, that looks fantastic!

Thanks 

For fonts, you can use nGC or Freetype (which works without any changes)

Does nGC support rendering into (raw) buffers with different width than the screen?

How big is Freetype? Doesn't it need a .ttf for rendering?

Writing a custom font rendering routine is easy, I only need two different font sizes, and I need real performance.
nGC uses the OS' font routines AFAIK which are slow and ugly, Freetype is probably slow as it's using splines, bezier-curves and such things.

I need speed because if I want to show text above a changing background, I'd have to render it every frame and transparency doesn't work with black fonts. I could probably find a workaround but rendering text into a buffer isn't exactly brilliant.

Bug Report: when I try running crafti, my nspire crashes and burns.

Gotta say, this looks incredible! Liking the new texture update.

Writing a custom font rendering routine is easy, I only need two different font sizes, and I need real performance.
nGC uses the OS' font routines AFAIK which are slow and ugly, Freetype is probably slow as it's using splines, bezier-curves and such things..

Well it depends whether you use a vector or bitmap font anyway. Of course the latter is faster but the former scales better. Also with bitmap fonts you'll most likely have to scale down, which is much slower than scaling up. So maybe there isn't that much of a difference.

will mobs ever be implemented?