Very fun but a little bit of QOL improvement would have cleared up some confusion I had right off the bat. The color choices you have seem inverted from the expected from other games. What I mean by that is red means locked or unavailable somehow, white means available, green means chosen or completed. The turbine and accelerators were available (as shown by 0/1) but the color of the text was red so my brain automatically discounted it as unavailable. Had those been white and the locked items been red, I would have noticed a difference and dropped them in immediately. Coloration on the upgrade tree is inverted as well. Perhaps a white if available, yellow if you dont have money for it, red if locked somehow and green when fully upgraded? Just a thought.
Very fun idea and good execution! It was fun to play with water like this!