I had about 25 hours into a campaign from the previous version, but gave up due to completely screwing my late game up. Never lost a single battle, but every time I sent my crews off to fight, the NPC allies would get annihilated somewhere, losing massive amounts of territory. It seemed pretty easy to lose the overall strategic battle due to RNG. I'll be starting a new campaign though with this version soon, off the GoG version.
Reading the Snapshot forums this seems to be a major problem with the game, early game RNG decides the outcome for the whole campaign, along with a pretty unforgiving game timer, and alien expansion. It definitely feels
at least as hard as old school UFO Defense/Terror From the Deep, maybe even more difficult. Early game mistakes especially get punished massively.
Firaxis XCOM and XCOM2 are cakewalks in comparison.
*EDIT* Hrm wow, good thing I gave up on my previous campaign, all old saves are incompatible with the new version.