Thanks for playing! Assuming you're talking about the level 'All about Vines', the hint there is that you don't need to necessarily click on the flower after you collect the key :) Thanks for the feedback though! Perhaps we should wait until later to introduce red herrings and mess with the players' minds.
Also, you can go to the level select and select any level to start at! We made sure that all of our levels were unlocked just in case anyone got stuck.