Oh, Just a few...
Demon Sperm (Dark souls parody)
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(Fallout parody)
BARRAGE (Halo parody)
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Dark star (Made by Grimhelm, them same guy who made Alien quest)
My forest home (Still in the works but good enough for now)
Night of Revenge (Same as above)
Succubus affection (Female on male rape)
She Ill Server (Might not be up your street but added it just incase)
Updating this since it's been a while and people keep liking this post.
Mystic Knight Maya (In the works, pretty good game but the pictures don't do it any justice)
Warrior Girl (Classic side scroller game, monster on female rape)
Castle of Temptation (Puzzle side scroller, still in the works, female/female monster on male rape)
Attack it! Devil Legion (Same creator as above, female on male rape)
ErisDysnomia (male on female rape, Corruption)
Ayura Crisis (same creator above, similar gameplay- not as good but still worth checking)
Kincaid (male monster on female furry rape, in the works)
DiBs: Tentacles in Spaaace (Plant on female furry rape, in the works)
Anthophobia (Old but gold, plant on female rape)
Mario is Missing: Peach's Untold tale (Old but gold, Mario parody, Abandoned)
Zetria (good animation, monster x female content, no rape)
Naylas Castle (Futa on female rape, in the works, you do the raping)
Passion Mortale (Futa on female rape, shit gameplay- good animation)
Their Happiest Hour (Same creator as above, same as above)
Mission Mermaiden ~Hasumi and the Deep Sea Sisters~ (Mostly monster on female rape but also female and male on female rape)
Captivity (Wave defence game, Monster on female rape)
Afterschool tag (Hide and seek- you do the hiding, female on shota rape)
Ayamerukie (Same creator as
She Ill Server, very early in the works)
Goblin Walker (Monster on female rape, you do the raping)
These are not Side-scrollers but I'm adding them because I'm pretty sure you'll enjoy them:
Nightmare★School～Lost Girls~ (Female on male rape)
Succubus Farm (Same creator as above, same as above)
Summer ~Life in the Countryside~ (Same creator as above, no rape)
Rignettas Adventure (Monster on female rape, Fun fact: the MC is based on the game developer)
EP Battle girl (Monster on female rape, Corruption, Grindy but fun)
EP doll (Same creator as above, same as above, NTR of a sex doll but no real story so decide for yourself)
Jessikas Curse (male/female/monster on male/female/monster rape, Good animations - But FUCKING HARD TO GET THEM!!!)
The Manager serves all (No rape)
NTR Legend (No rape, you do the NTRing)
NTRaholic (Fan-made game of the above)
The Holy Grail of Alharahn (Male/monster on female rape, Corruption, Old but gold)
Wings of Roldea (Same creator as above, similar gameplay)
