This is such a neat puzzle game! I love how you introduce the different puzzle elements. The puzzles aren't too difficult, I just finished the first 20 levels in about 40 or so minutes, but I had a great time! (I like the password system btw, much appreciated). All the mechanics are very intuitive, and while the visuals are simple, they do give that eerie sense of isolation.
Looking forward to trying out Tenebra 2 once I finish!