So, I tried playing again with the help of the Esc button - it works! :) I thought the key turning point in the story was when Lillian has to decide to be included in the bouquet or not ... But I got the same story ending both times. So yes, I'd be happy if you could reveal the end mystery to me. ;) I joined this jam's discord, so you can find me there (same name as here).
And about the situation when the lock wouldn't let me through... I don't remember which flowers I choose, but I know that I went back to the lock after collecting only 3 flowers and the lock said I could do a better job, so I went to get another one, but then it kept on saying the same thing ... Even though the picture of the 4th flower was added. I can explain more on Discord if you want. ;)