Hello! Thanks for the review!
The jigsaw puzzle can be moved, although I agree that the position may be a little awkward. I'll keep the several pieces being picked up at once in mind and also try to do something about the second riddle x).
I thought people would figure out that spacebar or enter are the keys to advance dialogue but I should probably put that on the page as well. And thanks for reporting the audio, I couldn't get it to work for me so I assumed it was broken.