Towards the end of the game, using miner drones instead of the reactors makes the game almost too trivial... they cannibalise the map in seconds and leave you with thousands of units of energy to spend on the massive ships. Then you have a constant source of offence and also huge energy reserves. Use with the upgrade that reduces ship build time and have a look.
Has anyone else noticed that if you hold Ctrl and roll the mouse ball forwards (so if you zoom), it gives you two options at the bottom of the screen, one which makes you lose and one which kills monsters? Thought that was quite interesting, can't find any other way to get onto it.