We are happy to know that you had fun with this game , for breathing mechanism you should only breath when the O2 quality indicator (the blue bar under the oxygen level bar) is full or at high level , if not then the mind control meter will start filling up and once completely full you will lose to lilly B. (you can reset the bars by going back to O2 capsule)
(press H to see help for more details) , once you got the retheme the game will be at the easy side.
Thank you for the great comment ...