I like the new campaign a lot and have spent a few hours on it. However, after getting to around mission #15, the mechs start to become more difficult, with HP and resistances increasing with each mech. The hardest mech I've encountered had 636 (!!) HP with 42 resistance (I've seen some with 45) on Normal. God Mode has 2,110 HP and 45 resistance. Maybe increase the reward slightly with each mission? I have also opened 3 silver boxes which gave me no mythicals (as usual ). Credits can be earned quickly in the campaign missions and have already generated 78k SM from them.

Clear your cache/cookies. The bots aren't supposed increase in resistance until later. It's actually a bug.

Fixed now anyway.