We have redesigned the UI so that you now select which shapes you want to use from the main menu. This takes you to a screen where you can adjust the difficulty and other settings, then continue on to play. Your settings will be saved for each type, so you can have different options ready to go. The settings have also been simplified, removing or combining advanced settings that people found confusing. There is now also an X button at the top right corner that will allow you to quit your current game at any time. 

These updates were based on user feedback. Feel free to let us know if you think there is something we can do to make the game better.