Very well done, congratulations to what is for most of you your first jam game. I really like the idea and the gameplay of combining all these elements, trying to figure out how to make each advanced version of the demons.
I agree with the suggestion, that time should be paused while you are browing the book, because it feels good to read the well-written stuff, but not so much if you get punished for it. Also, the poltergeist sprite overlaps with it's title so I could only hope that is what I created, because I could not read it.
While you are displaying the text at the end of the day, you should block the main loop interactions, because I could still finish my last creation while looking at it (I guess that's an achievement by itself) and it was counted for the next day. Or maybe I misunderstood that, but I know that I could still interact, I heard all the sfx.
When the guy with the menu still attached walked in, I had a legit chuckle...