yellowraain First few that come to my head that are similar (also come with struggle mechanics built in) are Mission Mermaiden (the downfall mod increases difficulty massively compared to base-game but does makes things more interesting) and Solas City Heroes also Seal of Lutellaria (which is a sequal to Setalia of demon realm) oh and Alien Quest: Eve but you likely know about that one already.
Then going a bit further from what they all have in common are: Castle Evil (less graphical more metroid-like), Ethereal LegioN (summon minions as you have little combat power) and She ill server (summon and attack well however...most H scenes are monsters on Human enemies).
There are others but those are what stand out to me in being similarly enough on the top of my head and bookmarks of completed stuff. (Solas City Heroes is on v1.0 but thread has yet to update due to Dev's rules/request)