Nice take on the theme! I enjoyed playing the game :D
One thing that is annoying, is that if you start by picking up all water droplets on ground, you will run out of juice and basically GameOver -> I'd have at least on source of regenerative water (like a pool that fills up slowly?) That would make the gameplay way less punishing for picking up all droplet on floor :)
Another one is, in certain areas you get too big and are forced to scale down, wasting lots of resources, which is annoying.
Besides that it was a fun game! Well done :)