Upgrades allow your planet to become stronger. Note that if somebody takes over your planet will keep your upgrades.
How to upgrade:
If you want to generate units faster, which I recommend, select the planet and click on "Upgrades". Now click on the "Upgrade" button next to the "Build units per cycle". You will notice that your current number of units per cycle increased. Note that this action will cost you some resources.
Increases the range of your planet and you can attack further away planets.
Increases the defenses of your planet and your units will be stronger to combat enemy attacks.
Increases the attack of your planet and your units will be stronger when you attack another planet.
Every planet has a maximum number of units, if you want more you can upgrade this. Can be useful to prepare a strong attack.
Increases the size of your planet so you can be more scary to other planets.
Decreases the radius of your planet so you can deceive other players. You can have a small planet but can have a big capacity and send a strong attack that the enemy will not expect.
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Originally published December 14, 2018, updated December 14, 2018