So... It's an interpreter (together with a virtual filesystem and some utilities) packaged into a program with a graphical display window? Still good for lots of interesting uses, I suppose, but surprising. Since it's introduced as a "virtual computer", I thought underneath the hood it would be emulating a machine. Then people, if they wanted, could tinker a level deeper than the scripting language, write an assembler etc.

That's how most of these fantasy machines are. Most people are only going to want to use a high-level language so it makes more sense this way.