XCOM 2 is on sale 60% off...

[zlefin]

How does the balance over time shift for the game?
one of the things I didn't like about original XCOM was how the hardest part was the first couple of months; and if you hadn't been wiped out by then (this was for the higher difficulties), you tended to stabilize and the game got easier and easier as your tech caught up, and your troops leveled.