PROS:
Very well made and enjoyable scenario. The initial North Korean attack is well engineered.
Great map. Good scale, looks great and works well.
The graphics are superb.
Scenario works well with no obvious bugs. Most of the unit stats work well.
CONS:
Could you add a reminder text event to change from summer to winter?
There are a few geographically isolated cities. (Kujang, Yangdok, Changjin & P'ungsan). Could these have some kind of road link or are they intentionally difficult to reach without Paratroopers & an airbase?
I would suggest including an engineer unit so UN can build fortified positions (fortresses). Without this option the game turns into a series of city sieges.
You could add village & town terrains with greater defence values. (instead of suburbs in countryside).
A few more smaller cities would spread out UN forces more thinly.
Remove airbases. They just get in the way!
Air protected stacks make defending Pusan relatively easy. They become less effective when Migs appear later in the game.
Aircraft defend cities first! Perhaps the air unit stats could be re-examined. Many times Sabres held off Chinese hoards without sustaining significant damage.
UN air power too strong. Aircraft really are the decisive weapon in this scenario. I know in ToTPP it is possible to limit the number of attacks per unit. This one small change would make units like the Banshee & Sabre far less destructive and as a result the scenario would be much more challenging. You could always give all air units 2 range to solve this at a stroke, though it would have the effect of more air protected stacks/blocking aircraft.
What is the purpose of the Soviet frontier? Could this unit slot be re-used?
Vladivostock etc... What is the purpose? Could you re-use these four?
For me there are not enough events. I would suggest adding more text. More verity. More rewards.
Chinese attacks are fairly predictable. They did cause me some problems but by and large I could see what was coming and shuffle units to meet the threat. How about adding more varied Chinese events, behind lines etc... Nearly all Chinese attacks in the west. Add more in Centre & East.
What is the end game? After a good first two thirds the scenario kind of peters out into a war of attrition. Just holding the northern cities for years gets a bit boring. I feel you could improve the end portion of this otherwise very good scenario.
I'm glad you're willing to take on constructive criticism of your work. I did really enjoy it and that is why I feel compelled to make these observations. With a little more work (hopefully all relatively simple) I can see this going from good to outstanding. You have a really solid basis to work from here! If you choose to leave it as it is that's not the end of the world. It works and it is a lot of fun, but I hope you consider making another push to really make The Korean War shine!