Thank you, very detailed review. A bit harsh though, for a jam at least...
The options screen is O. I forgot to put it in the tutorial, but it is listed on the game page, both in the text and one of the images. It has a volume slider and lists all the controls.
In my defence, I did almost everything by myself, designing and building the levels, all of the scripting. The only thing I had help with was writing the dialogue. This was my first rpg, so practically no experience for this type of game. One week was simply not enough to learn all the new stuff and get everything working flawlessly.
I plan on working on this game after the jam. I already have a long todo list, adding puzzles is already on it.