Many thanks, great feedback!
I will work on the improvements you suggested for the next update.
Regarding the resource cap: Actually there is a "soft"-cap. When you have more harvesters gathering at the same place the efficiency drops. When you closely look at the stats at the end of your game you can see, that at 11 minutes you have only half of the harvesters of the AI but 90% of the income. What you did was much more efficient than what the AI did. The resources are also limited, it is just not visible in the game. I have to improve that.