Some Feedback to 1940. I just finished Brighton, so I am not yet done.
- airfields ==> I dont see a reason for this feature. Was ok in SCW to get some nice planes but in 1939/1940 you only get crap. You never get the best available stuff, like a Spitfire II, so why whould you downgrade a 109-F to anything else? Ok, a Spitfire I might be ok if you run out of stuck, but 99% is crap. In the last "rommel-mission" there is a lot of back of forth and every time I reconquer an airfield I still have the chance for same planes.
- enemy hangers ==> well, tbh that is the most annoying feature I ever encountered in this game. I dont know if it works like intended.
1) I dont think it matters if you kill some hangars. In "Brighton" I could not kill just one hangar and the AI is getting around 10! planes all the time. So It doesnt matter if you kill hangar by hangar to recude the enemy reinforments, which is frustrating.
2) There is just too many. I am running 4 fighters, 2 AA guns. I am running out of ammo, even with heroes and stuff and I am not able to protect my army. If I try to kill the planes I cant protect my ground units and bombers. If I only defend I cant make some progress, If you think you are smart and shot the enemy down to 1-2 HP he just commits suicide...looks like ke knows he is getting new free stuff in exchange all the time

3) Respawn is too fast. You shot one down, AI gets a new one right now. There is just one turn when the new stuff flys to an airfield, after that he can use it. If you need some repairs you also lose one turn, so you won nothing at all. Imo the respawn should be delayed to 3 turns at least.
4) You cant kill some hangars. If they are proteced by bunkers and stuff and you will never kill them. That means you cant stop it.
5) The fighting feels strange. The enemy has unlimited supplies while you are shooting down hundreds of planes all the time...It feels like russia 1941 all the time, lose 1 kill 100.
I think it is a good idea to make sure the AI gets some planes during all the mission. Otherwise you kill everything in 3-5 turns and you could move all your fighters to reserve. But right now it is just an overkill, feels like fighting windmills all the time.
- hero system: hmmm, hard to say. I am farming prestige all the time to get always (~80%) the strong hero. Unfortunately already in 1940 I got too many of the same kind, I am forced to create some overpowered combinations, like "OverwhelmingAttack" + "Envelopment". Or just recycle seem to balance it myself.
Weak heroes are just useless, mediocre is no real option. If you have enough prestige pick the strong one, otherwise pick the weak one and recycle it.
Right I think if you play from SCW to 1946 it could be better to have just one 1 or max. 2 categories. To make it more random.
a) 1500 pretsige for "ok heroes" ==> if you recycle you still lose 500
b) 3000 prestige for "good heroes" ==> you still can be lucky (zero slots) are get some "crap".
- rommel mission ==> he was called ghost division. Not "you get some of his units so you always see what he is doing". It makes the mission unique, if you almost remove that feature and rommel is only supporting a bit you could also got the whole way like in SCW and put all units under the players control. And the missions are not working with DvG. Rommel himself gets always killed, there is nothing you can do, he is just too stupid.
- Brighton: I saved the kriegsmarine but this stupid dude still saves I lost everything. I guess you cant change the briefings?! And should I recived some message during the mission? Or get some token? I think i havent, the mission ends like always.
Sorry to say that, but almost all my feedback is neagtive

Maybe you just did not make it for DvG. If I run 20% more planes and 10% more AA it could feel differently.
Right now I got 4 fighters, 4 bombers and 4 level bombers in my stock. And I dont want to have more, I dont wont 50% over even more airforce in my army.
I am curious what other players say, especially to 1940. And how does your core look like? How strong is your airforce?