This is a pretty cool little game! I think the puzzles are really well balanced, starting off easy and then getting really demanding (no pun intended, xD).
I think the atmosphere is also pretty well achieved, there's still that horror and tension but the silence in the rounds allow me to think. Also, althought simple, the art style is effective and transmits what was needed.
Good job, Ricardo! It was a pleasure testing this game while you were working on it and now getting to play the final product!