Thanks for the feedback!
We are very aware that the perk system will still need a lot of attention, tweaking and balancing. We are doing feedback rounds on the perks from time to time where we go through all perks and adjust or change them if need be. These rounds will probably continue until the full release ;)
Also the game is currently biased a bit towards the early game and the late game lacks challenges once you have a bunch of high-level mercs. We already have a bunch of new lategame challenges planned but it will take quite a while until we get that in the game.