I really enjoyed your game, but I couldn't figure out how to continue after getting the key from the mine and the one from the village. The keys only allowed me to enter the second house, not the third and fourth. I also didn't understand how to open the hatch of the space ship.
It seemed like there was another part to the left that was only accessible once the water had risen, but I could go there. I suppose this was because of a lack of time.