I loved this game! It's really polished in many ways. The artstyle is very nice, and I love the attention to detail and the way you managed to highlight depth when you play with the printing machine. The mini-games are quite funny.
Overall a great prologue! As you mentioned already though it is not really a metroidvania, so I scored it lower there. I'm personally interested in what the rest of the game would look like. Keep up the great work!