' 3' Well, LunaSoft just open the site for their 5th game : 悪堕ラビリンス-囚われ魔王と奈落の狂人-
http://lunasoft.jp/product/lus004/index.html
Only really have the 11 girls and their profile for now.
But previous they had this on their twitter:
https://twitter.com/luna_software/status/492199909718634496/photo/1
Showing one of them pre/post corruption.
Also, they advertised it as Tower Defense SLG.
Given how there's the character sprite of each girl + that background, I feels this'll be something like a combination of Tsuzukuri Dragon with Dungeon Keeper '_ ' which to me sounds pretty damn awesome.
(Admittedly LunaSoft sometimes fall short on the content volume since they focus a bit more towards gameplay)