I can't upgrade thorium when the cost is 40 iron. I have over 400 iron, but nothing happens when I click on the button.
I suggest flashing the taskbar button when a new screen is unlocked. It took me a while to notice the mining screen at first.
Was the crystal formation near the tree meant to do something? I couldn't get it to do anything at any level.
The plants are a little difficult to get to light up so I can interact with them. I had a few plants that grew a bit, but never seemed to ripen.
EDIT: Are the mushrooms in the forest meant to do anything? They glow red with little particles around them like maybe they're meant to be important, but I didn't notice any effects if there were any.
Hey, crazygames has a copy of this on their site. I don't know if you've allowed this, or if they've swiped it, or what, but just in case: https://www.crazygames.com/game/orb-of-creation