One idea that never panned out was having an "end game" arrangement that required a very long combo--long enough that breaking the combo would likely mean finishing it would be impossible that day. But the color randomness when growing new tulips would become an issue for having the right color available to continue the combo, and that kind of difficulty wasn't aligning with the super cozy summer vibe that I wanted.
Thanks for playing, and I'm glad you enjoyed! :)