Nice little puzzle! Took me about 15 minutes, I enjoyed the moment of "that's it?" -> "wait I need to do that now?" -> "wait that's impossible" -> "ah-ha!".
My only complaint for this prototype is that it's a little hard to tell what's going on when multiple rooms are stacked vertically, due to how you zoom them in/out, but that's why it's a good thing the rooms are so simple and demand very little detail.