Now that I have the trainer and 999 Lives cheat going again I am now slowly making progress. I can't promise anything yet, though Areas 0-7 & 9 is fully completed and am now working on Area 8 before doing the last three...
I haven't bothered with the challenge rooms and doubt that I will anytime soon. Just wanting to complete the game and move on to Bionic Commando as soon as I am able to do so. BTW, so far one of the achievements is completed as well, the first one IIRC, and hopefully more will be as well before the end of the game.
If I get much further I can share my save if it'll help.
EDIT: I believe there is at least three unlocks within the game for BC. They are; "Prototype Weapon", "Purple Matrix", and "Retro Oufit". Already have the last one since you only need a save from BCR and it can be the very first save the game creates.
EDIT2: OK, done! I found a site with a full save and was going to use it if I didn't get far into the game but it wasn't needed since they both match with what is included, mine just has 900+ lives extra! Mine is also on Easy, which helped. Not sure what setting was used on the other.
If anyone wants a link to the site with it or specifically mine, let me know!