I... don't get it. There's no game here. Maybe I'm missing something, but there's only four buildings - Gold output, Oil output, conveyer belt, and a Storage that caps out at 250. That's it. There's no other content, nothing guiding to a goal, or even suggesting a goal.
When I first looked at this game I thought it would have some sort of progression - raw materials turning into refined materials that sell for more, and some sort of goal to go for.
In your intro, you say "...but wait, isn't something missing?" To me, the answer is "The rest of the game."