That looked like a fun game. Wow 23 British anti tank units! Were they all 17 pound guns, or a mix of 6 pound, 17 pound, and some self propelled?
The final map looks quite impressive too, it looks like you guys could have kept on going. Redrum City (Murder backwards) looks like it's living up to its name (that's the mid central city with the 2 suburb hexes attached to it).
You guys pretty much hit all the high points of my design too.
1. Ample, but not excessive, prestige to keep the game play active all the way to the very last (30!) turn, neither side is ever truly starved to death where they can't reinforce or purchase additional units. As long as they control a location they can deploy units, they have a chance to recover and counter-attack.
2. Victory dependent on victory hexes, but any combination of victory hexes. There is no front line, but there are half a dozen miniature 'fronts' (your arrows illustrate this nicely) that are all hotly contest at any time. After all, neither player ever has the strength to garrison all hexes all the time, so it becomes a game of cat and mouse with both sides probing their enemy for weaknesses, and trying to exploit those weaknesses before the opponent can react or make his own moves. I recall reading something about paratrooper assaults in there.

3. Neck and neck game where local unit advantages (Tiger II) don't mean that much in the big picture or grand scheme. Ending 4 to 5 seems to say the two sides are well suited to fight each other, as any true imbalances would cause a very skewed end result.
4. Replay value. I can pretty much guarantee the game you just played isn't a carbon copy of any previous experience you've had with Hylan Valley, and even if the two of you play the same map with the same sides, you will won't achieve the result you have here. You have more experience with the terrain, important rivers to control, roughly how the weather is, and most of all, you've learned from what works (and what doesn't work), you'll not repeat the same mistakes again, and you'll approach the future games with the lessons you learned here.
And of course:
5. You had fun.