A block that uses lots of fuel and energy to create mini-drones that could attack, collect resources or mine. It can only create a limit number of minions and only one type (attack / collect / mine).
Also there could be a rechargin station
A weapon that has a reasonable charging time after which it will launch a powerful beam of light that will last about 1-2 seconds. It is designed to attack from space and has an optional laser sight to aim the target from the ground.
A mechanic that consist in if you have for example a block of 2 x 2 of equal lasers, you could join them in a larger one to have more power for more cost