From the comments so far i see that a lot of people are struggling with the second puzzle. The unique selling point of the game is at the end, so i will tell you how to solve it, be aware, this is a spoiler so please try solving it before looking at the spoilers.
you solve the puzzle by going to the top left corner of the screen and taking the pause button. This may not be possible for some screen ratios so I'm sorry if that's the case, but if you go in Fullscreen it should be possibe