But you see, Mr. Liver, Masamune fully intended to feature graphics in the game made courtesy of a third party (Smiley13, I believe). But could not, because the game engine as it is breaches the 20kb runtime limit (hence the "bugs").
It's also worth taking in the context of its time; back in 1999, much like the "can gta be made in zzt" arguments of today, people were trying for a ZZT Tetris engine for some reason. Nobody could do it, even the best programmers around- then Masamune, previously known almost purely for hanging around in #darkdigital a lot, made the ZZTris engine and left shortly after.
My point? I just thought I'd give a little background. My thoughts on the actual game? It's a nice effort, but I'd rather play the original if that's okay.