The graphics are really nice. I like the small details like the space button prompt switching to lower case when pressed.
Limiting the player actions was a smart choice. The simplicity elevated the experience for me.
I have to admit, the gameplay confused me. At first I tried to just walk to the right and hope to find the door and spend around 60% of my meter. Then I tried ringing every door which then let me find the destination within the next 20%. I'm still not sure if that was the right thing to do.