Base development looks a bit SimCity or Caesar-esque, what with needing to clear territory to build structures that confer assorted strategy-game benefits.
Additionally, the stuff you build is where your harem hangs out, so constructing certain facilities is necessary to foster good relations with your women. (incoming append hotspring)
Example structures:
* Armorer (for building shit)
* Church (raises the "heal rating" of your base)
* School (raises general abilities)
* Somebody's house (for getting your freak on)
* Magician's lab (for alchemy, possibly other upgrades, and possibly also for H-magic down the road)
* Mines (stone appears to be the main resource)
* Natural obstructions (can plant your own trees)
More buildings means bigger and snazzier walls and gates.
Eushully is still using ATLAS to translate their subtitles and tooltips.
In combat, units look like they're organized into platoons with specific named leaders. Leader stats emphasize/offset the natural abilities and weaknesses of the troops you group them with.
Some stuff we all already know about units because they're always the same. Ditto for elemental weaknesses.
The game keeps track of the moon phases, which influences your ability to use certain magical or Old God-powered units and characters.
Ranking up your monster units causes them to grow breasts, so the lolicons in the audience have to do low-level runs so there.