Oxygen on the surface should not be spent, it was a bug. Since I did it alone and programmed everything from scratch, I did not have time to complete the planned gameplay and plot, because working through each part of the game to such a quality takes a lot of time, this is my mistake, I should have made it easier. I found out about jam the day the topic was announced and was not prepared for it. Therefore, I managed to do only a battle with the boss. This is my second jam so I don't really understand what kind of games to make for jams yet. I learn all my mistakes. Thanks for the feedback.