Freaky AND Cool!
It's good that it wasn't too hard, because no one likes mind-busting puzzles. But I could be wrong~ Anyways, this game was really great, and I give you props on the storyline. Albeit, I had trouble on the code. So I'm providing a spoiler! ^^
(Please do not read this is you wish to complete the game without help)
*o*o*SPOILER*o*o*
The code to the Accerbus Room is in the Library, click the sheets on the table after talking to Alexander (Rat Man) and zoom in to see the correct numbers, it's diffrent for everyone. After going back you'll fight a monster.