Yeah it's pretty rare. Attack it Devil Legion as mentioned is all I can think of. The idea of it is good in that game, but the execution could use some work. The scrolling screen and the controls ruined it for me. That game doesn't use the "send monsters at your enemies" gimmick as well as this game imo. I found the gameplay in Attack it Devil Legion pretty obnoxious. You control the player and the camera both with the mouse, it makes things really awkward. They tried to make a game a 1handed game basically that really needs 2 hands.
Oh, I remembered another one.
Heroine Hunting. The genre is a bit different, you're a trap master who oversees things rather than a player in the world, but it's a similar feel with the monsters and sex stuff.