Sorry to hear you were having trouble. The code for the first door is 1903.
Next time please leave your grievances with the game to a single post. I'm not against hearing criticism, even if its from people who dislike a lot of core aspects. But please do me a favour and leave it within the replies of this post.
In another note. A lot of the game's features are not yet implemented and are fairly placeholder. Either a walkthrough will eventually be created when all the puzzles are finished. Or we will straight up add a skip button for those who are having trouble.