Hello Steven78,
Amazing finds there, and thanks for posting the contents!
I've been running smspower.org since 1997 where among other things we are cataloguing dumping and releasing Sega 8-bit contents.
For being quite minor systems (compared to the NES) unreleased games are less common but we managed to uncover a few dozen so far.
http://www.smspower.org/Tags/Unre...
If you need any help with identifying the data for Bubsy II (various builds and/or tools and/or unknown files, etc.), Dragon's Fury 2 or anything related to the Master System and Game Gear, I'd be very happy to help.
Needless to say it'll be super nice if that Bubsy II dump could be released and if there is a way we can assist you to make that happen don't hesitate to ask.
I'm reachable here or by e-mail omar AT miracleworld DOT net if there's any need.
Regards and thanks again for sharing,
Omar/Bock