Oversun
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Many mini-mods, but the most useful one increases the number of "shots" for the tent. There is no imbalance, as everyone has a tent, but it significantly increases its importance (by the way, you can also increase its price, by a factor of three).
A good idea with goblin archers, although it does affect the balance. The upgrades don't have a shooting animation, so did you not give them one? Maybe it would be better to make one of the goblin upgrades an archer (replace one), even with the model of a regular goblin?
All other mods significantly affect the balance, so I'm not considering them.
Thank you.
PS: I once added an alternative upgrade for mages, giving them a poison cloud and poison, and it looked impressive.