less of an engine and more of "title card and text engine jankily added to NGSE" The S1 sprites will come eventually, and probably work MODule-style as a seperate sprite so that multiple characters will be easy
pretty much everything changed is by DWONKY, such as the text engine https://scratch.mit.edu/projects/648114813/ and the BG/music https://scratch.mit.edu/projects/648953850/