Looks nice. will you have an option to redraw each pic every time the game is run, so they do not need to be on calc when the game is not running?

Again, amazing job! Quad sprites. Wow.

I don't codex is best for you: It only moves the contrast up and down and you probably want a specific number.  I wonder if there is anything just like xLib's contrast function, but with just that.  (Hint Hint Asmers)

You could leave Codex (If you use it) in archive and put it in XTEMP001 or something whenever the program is run.

Ah...
That's where it's from.

Sounds cool.  So you would upload your program.z80 and get program.8xp online. 
With things like this, your site could be a nice place for asm resources.

I'm anti-xLib for just using it when other programs are possible.  You can use this to change the contrast: http://www.ticalc.org/archives/files/fileinfo/125/12500.html
I'm not sure how it works; I've never tried it.  Are there any other programs that change the contrast? (Celtic II mabey)
The reason I'm anti-xLib-when-possible is because xLib installs a parser hook.  This parser hook SLOWS DOWN BASIC PROGRAMS.  I think you'd want this game running at full speed, right.  In this case, I'd strongly advise not using xLib.

I really like your ideas and I can't wait for a screenshot.

Edit: Use Codex!  Since you already know how to use it, this could be a breeze.  Codex can change the contrast.

But where did it all come from? Who said he was a lobster?

Cool! That sounds really awesome! How long have you been planing this?