The game is very promising, even dou it's a simple concept. My advices are as follows:
1) The game should run on a different engine, so that the gameplay would be more flexible. Make it so the player has more freedom of what he's going to do. For example let the player choose where to put the seeds and what kind of seeds (make more variations of plants and make them usefull for the gameplay). You could make it so the player can choose what type of mud golem he's going to make. In overall you could make a game about developing your own civilization or your own archipelago with some adventure game moments or just some tasks to do to progress certain development.
2) Hire some good artist to enhance the graphic quality. Some graphical additions can help the game, for example with some minor graphical hints show that the actions player made, increased the power of earth and not only by the earth elemental saying it and having less of those corrupted stones on herself. I'm a professional artist, but I have very little experience so I think I would be a waste of your time and money, but if you were interested you can always PM me
3) With some thinking and love for the game you can come up with a neat story. The thing about corrupted stones on the earth elemental makes an easy way of coming up with the plot for the game. For example there are an evil forces that are limiting/using the powers of the elementals and it's your job as the player to find a solution for this. Also, while freeing the elementals from the influence of the corrupted powers, you could've gain an ability to enhance your character with the power of the certain element you helped with.
My major issues with the game so far:
The gameplay is a bit too slow and too stiff. The graphics are not good enough for fap material. The game lacks animation or some slideshow element which is very important while making a porn game. Lastly, eyes of the earth elemental are fucking terrifying and ugly.
Keep up the good work and good luck with the game!