It is interesting, but too much grinding for my taste. Even with 15 litres jug it is just tedious to raise money for pretty much anything else. Also in the instructions "Placement mode" is just mentioned. Could use more info about water extractor, water tank, water purifier and bottler - explain the whole chain that could be when water is cleaner (also, placed the pipe when I was in the menu and expecting that the game ios paused - I was trying to leave placement mode without placing anything).
For how much grinding is needed, it is missing "save game" (or minimize to tray) option. And to properly play it I could not play it in browser because mouse was leaving the game so I was not able to turn 180 degrees - mouse just left the game (two monitor setup, firefox).
The bug with water purity 0 when picking up bottles is basically that last bottle you pick determines water purity for the whole stack. And bottler gives you water purity of not yet bottled water inside its tank. When all the water is bottled, the purity is 0. So you can bypass it by pouring some water to the bottler just before you are about to pick up all the bottles.