Great game. Only issues:
The permanent machine noise is pretty annoying. It should only be hearable when you're REALLY nearby the machines. Otherwise I would have to turn the sound off as soon as I built the first pumping machine.
Second: The names of the machines (the letters) shine through everything. So I can even swim to the other side of the lake and still see them through all the trees.
Apart from that: Fun game. Reminds me of Cookie Clicker.