Thank you, that is valuable feedback.
Without oxygen, movement is infinite, therefore it somewhat becomes a walking simulator, actions lose weight. It may need some tweaking, and I do consider a puzzle mode without oxygen, but I can see what you are saying. In anyway, I did not want the game to be a plan ahead to finish in less than X moves, hence the last breath sequence, and overall, tried to balance things to not be too punishing.
Have a great day