[vidarh]

There was also a BASIC version of Lightning. I never had the Forth version, but played around with the BASIC variant.

BASIC implementations of everything in that Youtube video came with it, and it had funky things like pre-emptively multitasking for BASIC programs (fairly simple - just use an interrupt or hook into one of the BASIC entrypoints and count time slices and shift some pointers around) + separate programmable sprite animations (so you e.g. could start sliding a sprite over the screen and let your BASIC program keep doing other stuff