The humidity makes for torpor, and fluid blobs fit the bill. Click strategically to remove colors and meld remaining blobs: "The blobs are trapped, and only you can free them. Click groups of them to make them disappear, and use special items to improve your score!"
If you don't meet your goal, there'll be a "Replay level" option on the screen after the "Game Over."
It's called Gluey:




