No worries.
Before i leave for a short vacation (and forget details) here are some more observations from my continued play. I'm nearing the end of month 3.
I did the second cleaner cell. Shield and assault soldiers had warden armor, everyone else none. Pistols and shotguns were upgraded to laser, rifles and sniper were still acc. I advanced towards the east, which turned out to be the correct direction. Reinforcements started to arrive shortly after i had found the VIP. No engagement with the reinforcements, and this was the only mission were i had 0 causulties. Which seconds my earlier point - the difference between advancing in the right direction and the wrong direction makes a huge difference in diffuculty in this mission.
A few days after that i tried the cleaner HQ, but reloaded a save before that after closing in on the final room. The "attack base" mission was a welcome difference to the usual missions. I can't say if my rather substanial losses were due to my mistakes or the difficulty of the mission (the beginning felt good - once i encountered sentry guns things started to go down). I will attempt the mission later, with better gear and more soldiers. My verdict on the cleaner missions in general is, that they should not be attempted when they pop up but later. Take advantage of the fact, that these missions are permanent. (Due to low starting panic, i had no trouble with panic)
After that i had 3 UFOs pop up during a timeframe of one or two days. My angels were in repair (turns out they are no match for UFO fighters), so a small UFO, a medium UFO and a landed UFO turned up. I would have tried going for the landed one, but the medium one attacked my base.
Defending my base was an interesseting mission. Especially since the tactical map is based on my base layout. I took quite some losses (1 sentry gun, 4 soldiers - but only 2 soldiers remained dead after the mission), but it felt the aliens started to ramp up.
One potential bug: I had started constructing the dragonfly dropship but that stopped due to not enough storeroom. However after building a second storeroom the project was still on hold - i had to scratch it (and all progress on it).
Not a bug but a strange UI-thing: After the base defense mission i had recovered one destroyed sentry gun, which enabled the repair sentry gun engineering project. The popup "new engineering project available" only offered me to "assign new research project".
I don't know if it is because i'm not that good at the game but expanding feels incredible expensive. I built a second base in asia and outfitted it only with a radar and two hangers. But building new interceptors were expensive (to be fair, i could have built 2 angels, but decided to wait, since i was close on finishing the research and the improved interceptor - which i can't build because i lack enough alenium, oh well). I think i will have to invest at least half of my funding for next month to get the second base up and running. All while i feel ill matched with the aliens if i go by the base defense mission. However maybe that feeling is desired, since it feels like trying to catch up but never being fully on par (there are still so many research project i want to do...)
All in all, i have a lot of fun with the game so far, but the pacing feels a little off. In the beginning not much is happening (a lot of waiting), the cleaner missions seems to pop too early and by the end of month 3 things start to pick up maybe a bit too fast.