Olá de novo Med, obrigado por teres jogado e deixado algumas notas. Espero que não importes mas vou continuar a resposta em inglês. The team agrees that some puzzles may not be fully understood at the beginning but we believe this enhances the overall stressful experience. We are discussing ideas on how to improve this whilst respecting the theme.
In relation to the math puzzle, we have handled the issue that we believe is not about a bug, but rather clarity of what's expected from player, (see point above). All in all, it's a game design choice that puzzles may not be fully correct to progress through the game. Nonetheless, thank you for feedback and we hope to see you back on a possible future major update.