90 Water drops
Lots of combinations, +5 and cascading crops are needed for this level.
You have a lot of oysters to collect and the only way you can get all these is to open more than one at a time while doing the above.
Boosters come in handy here unfortunately, but at least it means you pass if you need to use them.
The companions both have their uses, but don't always help, a lot of it comes down to luck.
The small squares of grass are handy for removing slime sometimes.