Hello McGuba,
congratulations for an outstanding peace of work! It really takes the game to another level, and makes it feel alive like never before. I should curse you though, as it is an insane timesink, and I actually didn't have the time I've wasted on the game anyway
A couple of comments and suggestons from my side:
I do believe that either the units should be a bit cheaper, or alternatively you should get a bit more prestige per turn. As it stands now, there are a lot of unit types I can only dream of getting into my core. Basically all of the better Artillery units are prohibitively expensive, and there isn't even an upgrade path for let's say the 15cm to 17/21cm. Fancy stuff like Wurfrahmen I'm not even thinking of.
Upgrading my Panzer forces to the Pz3/4 line as well as converting 2 of my 109 squads fo Fw190s pretty much ate up everything I had on spare resources, even though my campaign has been fairly successful until recently.
It's March '43 now in my game, and after a good year 1942, where I took Moscow and Malta, while preparing the siege of Leningrad, which will fall within the next 2 or 3 turns, I feel that the game is lost now anyways. Even though I played my cards in Russia safely by keeping the front line rather short (basically Odessa-Dnepopretrovsk-Charkow-Kursk-Moscow), I'm hardly able to contain the massive strike the Red Army is dealing from the area east of Charkov. Endless waves of really hard to crack T34/43, KV1s, the assortment of Allied shipment units, 5 trillion Infs are not what's finally killing me there, it's the huge wave of Tactical Bombers, which are dishing out obscene damage when attacking my tanks.
Maybe I just had a streak of bad rolls, but I had to take several hits of 4-6 damage on my Pz3 and 4s, making them easy work to finish off for the T34s. Wish my Bf-110s were that deadly...
With my slim income of approx. 1000PP per turn I have no idea how to recover these losses. On top Albert Speer has been exposed as an incompetent fool by coming off with a laughable 100 points from organizing the total war industry. That's just enough for the treads of a single Pz4, Albert!
You may get what I'm trying to say, I think should review this point.
On to the next scene of action, Africa. So, the brits launched their offensive from Suez, the US have landed in the west. I stayed pretty passive in Africa so far, just turtling around Benghazi, fending off the occasional Matildas and Crusaders. I was fairly successful at Sea, and the Italian Navy managed to sink the Valiant, her Light Cruiser escorts, as well as the Carriers Ark Royal and Eagle. That enabled me to seize Malta with the help of Rudel.
Unfortunately I wasn't able to deal with the british subs, which brings me to my next concern. Subs in their current state are overpowered, especially when submerged. A single Destroyer will lose a 1 on 1 with a Sub in 8 out 10 times(the crappy Italian ones in 9 out of 10). That isn't a problem for the Royal Navy, as they have like 200 of them, but is one for me as the player
So now I'm in the funny position of having 2 Battleships and 2 Heavy Cruisers who aspire to rule the Mediterranian sea, but effectively are on the steady run from British subs
...which is bad as I could reeeeaaaally use them now as Artillery support against the US forces. Yeah, I probably could divert Bombers from Russia, but as bleak as the situation there currently is, I don't want send them on sub-hunting.
Lets get back onto shore. So, the Suez force arrived at Benghazi, and what have my sandy eyes to gaze upon? Not a bigger numbers of units, as expected, but a group of 4 invincible juggernauts, led by a STR13 Chevy Truck. My Infantry was deeply entrenched around the hills and mountains, Artillery behind. I thought, I might be able to hold the line for a while, even with my 88 and the tanks being sent to Tunis. Well, no, that Chevy Truck of Death from Murder Mountain nearly disintegrated my Bersalgieri with the 1st attack
Needless to say that idea of "holding the line" can be described as wishful thinking after all.
So my critique here is, how come that some colony forces have that amount of experience. 3 Stars, that equals my most experienced Panzer units on the eastern front, after nearly 2 years of constant fighting. It's not only virtually impossible to cope with, it just doesn't feel right.
To a certain extend that also goes for the numerous 2* units in Russia. The Red Army was famous for huge numbers, the Wehrmacht for being well trained and experienced. Here, the Red Army has it all.
Off to the west, and my last big headache. Others complained already about it, and I see you already have a plan to change it. It's those freaking range attacking, vision establishing mines of course.
They are the last nail on the coffin for my initial plan of invading GB, while holding off Joe in the east, then plowing my way towards Babylon after Churchill has been put to final retirement.
I tried a sneak invasion in Wales early December. The idea was to bank on bad weather, so they wouldn't see me until it is too late for Royal Navy to react properly. I was able to sink one of their Battleships, 2 Cruisers and some Destroyers, when they caught my surface fleet on a pirate run a couple of months before, but I lost some of my Cruisers too, and had to retreat before they could sink my Capital ships, which took some damage in the process. So, having the element of surprise was crucial for success. Didn't happen, and not only I had the still sizable Royal Navy swarming me in no time, also the mines took good advantage of the fact that my transports would have to end their turns beside them, due to the narrowness between Ireland and Wales.
What's really bad on top of all their traits is that there are no sensible means of dealing with them, but I know, this has already been discussed just a couple of posts ago.
So, I'll end my WW2 on Turn 44, and while I failed, I had a blast on the process.
Just...one more turn is CIV's motto, but you Sir, have taken it to a new level. Hitting the button with the hourglass filled me with anticipation, hope, fear, ecstasy and despair, every.single.time. Hats off, and shame so few people have enjoyed your incredible work. Guess I can see myself as a proud member of an exclusive club
But it only lasts for a couple of turns and after that the white hell gives its way back to the nice greens and the country name markers will become visible again. 
Which is 170x110 hexes with some 2000 Allied and 400 Axis units pre-placed. But only a fraction of those should be present in the map at the same time. Most of them appear in later turns and by then the earlier ones are destroyed.
You have to experiment if you want any bigger than this, I am afraid. It may or may not work. I can only say it works fine with this size throughout 99 turns, with a few hundred units present on the map in each turn. 
