I can't thank you enough for your support, this is tremendous feedback and it feels really vindicating that you identified so much of what I was going for with this experience.
I was nervous that this pacing would turn people off before "the real game" kicks off, and its a huge relief that the contrast was a bonus for you. To be honest, the Museum and the early parts of The Main Frame were as much a tutorial for me in putting the game together as they were for the player. It was really fun to take those concepts to their full-ish potential with the end game levels.
I knew the library hint was going to be "the hardest", and purposely made sure I had the timestamped Youtube vid available in case it ended up being too unfair. This is one of the main feedback points I am looking for, and I want to gauge what the sweetspot is for providing information if and when I expand on this.
Again, I can't thank you enough. The writing is all over the place, and I had about 100 bugs identifed before anyone else had even played it, but to know someone enjoyed this experience makes it all worth it. I knew it would be hard to ask people to take a leap of faith on a visually unremarkable 2d platformer, and I'm really happy it ended up being worthwhile for you.
Sorry for the long response, I never expected such positive feedback and am just very grateful