Good news: it worked like a charm! I was able to get a good ending and now I'll see if I can find some others. Thank you again for your help!
If you want, a simple, spoiler free and hinting instead of outright answering guide to getting all the endings read below.
Good Ending?: Complete the game without achieving any other endings.
Bad Ending: Fall at the last hurdle.
Secret Endings 1: Find the secret files, input the secret code you get from looking within instead of the one the game asks for. Make a choice at the ending.
Secret Endings 2: Find the secret files, input the secret code you get from looking within instead of the one the game asks for. Make a different choice at the ending.