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Units

You can earn units through levels, or obtaining a random one from a star box, which can be bought for 15 runes. Rarity varies by their star rating (1-4). Units can be upgraded, which increases health and their damage multiplier, amount of health per upgrade depends on their health, damage multiplier increases more depending on the units star rating (0.15 x Star rating per upgrade). If you have a unit that you don't care about just sell it!

Fighting

You have 2 main attacks and a super, each unit has their own super (except some 1 star units). When it charges up you can press "Super" button or LShift to activate it, making you invincible until it is finished. If you're not on FreeForAll mode, and you have at least 1 teammate left, when you die you will automatically switch to a living unit.