According to @skyistumbling, This game was one of, if not the first, ever D7-like engine on Scratch. Contrary to popular belief, this engine was not made by @daves777; Rather, it was created by @bigB.

To be one of the first couple hundred people to see this project must've been mind-blowing! Most kids on Scratch now weren't even born when this demonstration was first released to the public.

The engine still holds up today, utilizing a unique retro-arcade style and being the first "sprite-by-sprite" 3d cloning game. Some games still use 3DEXP; Though, they are usualy copy and pasted Minecraft clones...