More info here http://www.indieretronews.com/2017/10/draconian-awesome-1980s-multi.html#more
Check out this amazing clone of Namco's Bosconian on the humble 2600.
edit, just tried the prototype out and it's really faithful right down to having the voice samples. The big difference besides the obvious graphical downgrade is it runs a little slower than it's arcade inspiration.