This was fun to play! The audio change from the void-fridge is awesome lol, and the gameplay engaged problem-solving skills well.
This may have just been me, but I originally did not view the puzzle wall as four different sections. I thought the bathtub shape was some sort of time boost (hourglass), and the moon shape was what I was fixating on.
The fridge audio change made me feel like something was now different or "revealed" in the level, like a pattern in the room with the tiny tiles.
It wasn't until I tried inputting triangles in different ways that the top right box game me the connect-the-dots feedback. From there I was able to make sense of the other shapes I had found.
Early on, differentiating a locked door in need of a key from a plain "Locked" door was a little confusing, especially since it's possible to end up with an extra key.
Overall, the game was fun to play and kept me around to finish it! Well done!