My score is 16!
I really like the idea! Excellent execution for a game jam in the limited time.
I think it can be a bit repetitive, if you do a future iteration introducing the new versions of plants later on would be more fun/keep you on your toes. I had a lot of trouble with the "bloom" button and it would be nice if that bar changed size/position for variety. It was also unclear for a bit what the "shiny" and "dripping" icons meant.
But again, great concept and execution, could use a little more iterating for smoothness but I'm sure you know that- great job finishing in the time!