Thanks for playing!
For what it's worth, the safe puzzle is easily the most "involved" in the whole game, on account of the fact that it requires you to either take notes or memorise hints from different areas of the game and figure out how to use them to figure out the safe's code. Don't feel too bad if you couldn't figure it out, I'd probably get stuck too if I hadn't written the thing.
Even if you weren't able to reach the end, I'm glad to hear you were able to have fun. Maybe someday if I get around to doing updates on the game, I'll include the actual solutions within the in-game hints system for people who get too stuck to continue all the way.