The first idea: rebuild the interface!
Use a long bar to put on the same level all the icons. In the same place, place the bar of gold / oil (also yield information of gold per second) and should also be information on the number of oil derrick, and power generators to supply oil derrick.
Second idea: technology tree!
Everything is chaotic! I do not know what technology upgrades by as soon as possible (for example) get assault gun! Clicking on the research facility should be a window with the categories (for example): turrets> Cannons> Cannon Light> Upgrades for this turret. Now, for example, I want to have a heavy cannon. What should I do? First I have to upgrade light cannon, then a medium cannon at the end of heavy cannon. All this should be placed in the tree technology. Again, for example, at the beginning of the game I thought to myself that I want to have a bombard. I click on the Research Facility, select a category turrets> Mortars> and I see Bombarda, but is unavailable because it is not upgrade Mortar. So upgrade mortar, and then bombard! What is a simple and easy!
The third idea: graphic!
Use a better texture and add more options to graphics
Fourth idea: host game!
When creating a game room, they should be able to change all the options available before the creation of the game.

