No, I haven't abandoned it. I've been knee-deep in so much shit it's unbelievable, but currently my team is hell-bent on releasing Hypertension before the end of the year so this will have to definitely take a back seat.
I did make progress since I last posted here - Alone 1's collision detection is now working, sort of. It's not proper but projectiles now work! Alone 2 reads the menus correctly, skips the intro (since a script regression causes it to crash) and the AI attacks the player now. Still lots of serious bugs, but it's coming along.
Alone 3 was able to load, but without being able to read speech or music from CD, it's like a silent film save for the few sound effects still present in the game data. So there's that...