Since this thread was from 2018, I guess the people here already knew these, but to those newcomers:
Top-down Tower Defense style
RJ226905 [Circle Itomagoi] Sexual Violation x Tower Defense
RJ387737 [くまさんズ] Monster Girls TD
RJ207879 [Arrowkey] Cendres
RJ086864 [7th Dream] Pretty Warrior May Cry (the RJ no longer exist in DLSite?)
**A few years back, there was one game where you create a harem-battalion of captured girls(?) with some element of city-building, but I didn't play the game and I can't remember what it was...
Horizontal Tower Defense style
RJ196860 [Odae Cemetery] Raspberyl Castle!
RJ223514 [Circle King] Womens Defence
RJ301403 [Ririkku box] Sexual Beasts Night and the Fallen Saint / Sexual Beasts Night and Female Elf Knight
RJ223394 [NineBirdHouse] Princess Defender
Edit: Castle Fight style
**There were also a few made by the western team, with but I can't remember the names.
You basically click on which unit you want to spawn from the bottom left tab. The game allows for a few leveling up your army, fight the enemy female generals, capture their hearts, then repeat. Fights give you money, the generals enable unique battle command (or Active-Skill).
Hero defense style
RJ246264 [PanzerSoft] Priscia Defense
RJ209760 [Moyashi] Eliminator Kaede (you can play as 1.lonesome wonderer / 2.Third-person shooter / 3.3PS + turrets + landmines
Turn-based shoot-out style
RJ264935 [Dystopia Story] Flying Princess: Inter Breed