I think it's a fantastic idea.
There was a problem I was having with it though. I bought an old OOOLD laptop with like 8mb of RAM and had movitz on a floppy just to keep something in my car that had a repl. Like old computers would have a BASIC prompt.
Anything entered would need to be shorter than the width of the screen, or weird errors would happen.
Granted, I know it's more of a compiler than a prompt in design... I suppose I could learn more and write a more robust prompt USING Movitz.
I hope someone writes a full, usable kernel/OS with this in the next few years.