Haha so harassing with your starting girl doesn't work at all, they're incredibly weak until you get them to Normal. Even workers can beat them up on Easy!
It seems each faction is identical, except that leveling up your heroes sometimes also provides unique technologies to your army. For instance, leveling up Reimu increases the strength of your walls, and leveling up Suika allows you to produce Mini-Suikas from your breweries. At the moment, I would describe Hakurei as the defensive faction, SDM as offensive (holy shit flandre), and Netherworld has neat mobility features (Youmu is the fastest starting girl, Yukari can make gaps)
Lots of things are streamlined compared to AoE2, most importantly that you don't need to have dropoff points for resources. Your workers can gather stuff anywhere on the map, which I think is really cool. Walls are also way more useful because since they're just magical barriers, your own units can just walk right over them! However, turtling doesn't work, because you need to kill units to get points, which you need to start researching things past Normal.
I also really like a lot of the UI features in this game, like the little counters that tell you how many of each worker are doing each thing, it's much less demanding in terms of macro.
Here's something that isn't really a bug but seems like it would be a convenient change. It seems if a building is obstructed on all sides, it cannot finish building a unit, as pictured.
However, since units can walk over spell circles no problem, it would be nice if they would simply spawn inside it if there's no room on the inside.
Also, it would be nice if they used the resource icons in the tooltips for units that show how much they cost, rather than text, it would help non-japanese speakers pick up the game faster.
One more thing, workers in breweries should probably count towards the number of workers gathering booze in the bottom left tab.
As it stands, once we know what the abilities do, I don't think the game needs to be translated, it's very easy to pick up.
Also the pathfinding is pretty questionable, but actually it seems to affect your workers more than your combat units (who can move through each other, so it's not a big deal) since they'll shuffle back and forth futilely trying to find a spot on the booze pile or shrine to start working. Units also tend to get trapped in crescent-shaped forests easily.