Before deploying your forces, learn the enemy base's layout. Position your troops in the most favorable locations. You cannot control the units after they have been deployed. When attacking enemy bases, begin by eliminating their towers and other defensive structures. When approaching a tower, send in units that have the highest health first. The tower will attack them and allow more vulnerable units that have higher attack power to act safely. If your units become stuck in an bad situation, retreat then regroup and attack later. You will keep any units that are still active.
Fusion Cells
Fusion cells are the game's premium currency. Complete missions to earn them, as well as strengthen your base.
Resources
Build oil depots and mineral silos to increase your maximum storage capacity for oil and minerals. Level them up to increase their usefulness. Any resources earned while your capacity is full is wasted.