It seems that my melee bots didn't do any damage while joined. And since melee damage is always two-way it was kinda usless aniway, enemies spawn far more hp than I do. I tried to go ranged (though ranged bots seemed to be rare). They do shoot while joined, so I could keep them safe. But their damage was again little or nonexistent. I like the idea, but there are some problems with implementation or with conveying the rools.
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Yes, it is my bad since i didn't have time to properly explain the mechanic in some kind of tutorial.
But basically, different bots give you different types of powerups when merged, Circle bots give you damage while ranged only gives you range attack. You still need to combine these two for dealing damage. Only having ranged won't deal that much damage.
Keep in mind that you won't spawn circle bots when joined together, only when disconnected.
Thank you for the feedback!