A thing to fix up, low priority: if you own land near the edge of the map (1575ish), it shows as an artifact at the far end of the map when looking at the last map section. It's pretty clear what's going on, and won't impact play experience, but will look more polished to have cleaned up.
EDIT: Also note that the tooltip/popups don't update to actions in the quadrant until you leave/return. That is, if you take a tile from someone, and mouseover it, it will still say it belongs to them. (Or if you killed a few forts, it'll say the old number; or if you evac'd, it'll say that it still belongs to you.)
More importantly, if you are skirmishing/battling, your map will not update to enemy actions until you leave/return to quadrant.
Consider an 'Evacuate this quadrant' command, for people who have clearly lost a battle and would prefer not to lose their entire nation to get back to playing.
There are currently a couple of techs with really large benefits compared to others, most notably Blimps. You may want to consider if this is as desired, and if not, tweak the formulae to make them more moderate.
Look into the PVP XP formula -- when leveling up and continuing to attack the player, I was gaining more xp than before, where I would expect to gain less (because I now more clearly outmatch them). I suspect the formula is currently weighted to make it effective/valuable to obliterate newbies as a big player, which is likely not what you're aiming for.
Last, I'm not sure that there's much point in the current instance. We seem to have two players, maybe three (the last might be mostly or entirely bot), and in that case there is sufficient first-mover advantage to allow one player to monopolize the gamespace, so long as they continue to pay attn to the game. (Specifically, the benefits from holding large numbers of landmarks, which you get from Blimps; in a real game, many players would reach this point semi-simultaneously.) If you care to get feedback about warfare/factions/coldwars/etc., as opposed to basic game mechanic stuff, you'll need a couple more active players of similar size (meaning having a chance over maybe 10% to win attacks against each other). Or maybe computer-generated 'players' to play the roles.
Hope the coding is proceeding nicely!
EDIT 2: minor issue, the tooltips/popups are on a lower layer than the side-of-map scrolling arrows, it would be nice if they were 'above' the arrows.