I really enjoyed your game! I think it encapsulated the theme very well. I loved how you showed both the growth of the coral and what sort of impact dismantling the oil rig would have, along with how it would disrupt the positive ecological impact it's currently making. Your game did a good job in showing that environmental progress is not a black-and-white situation (like with removing all of the oil rigs from the ocean just because they're not "natural").
I'm interested in seeing if any new mechanics are added in the final release and how it progresses from here. Nice job!