Games like Demonheart
Games like Demonheart include LoveChoice, 月华辉映之刻, Hatoful Boyfriend, Our Life: Beginnings & Always, and Amnesia™: Memories. We matched them by the tags players give Demonheart on Steam (Visual Novel, Otome, Female Protagonist, Villain Protagonist, and Romance): closest matches first, and among equally close ones the better-known games.

LoveChoice
Shared: Visual Novel · Romance · Dating Sim

月华辉映之刻
Shared: Female Protagonist · Otome · Visual Novel

Hatoful Boyfriend
Shared: Visual Novel · Female Protagonist · Otome

Our Life: Beginnings & Always
Shared: Visual Novel · Romance · LGBTQ+

Amnesia™: Memories
Shared: Visual Novel · Otome · Female Protagonist

私のリアルは充実しすぎている フルボイス版
Shared: Otome · Visual Novel · Female Protagonist

Sweet Home
Shared: Visual Novel · Female Protagonist · LGBTQ+

1 to 1 humanoid edible toys
Shared: Visual Novel · Female Protagonist · Dating Sim

Love Is All Around
Shared: Visual Novel · Dating Sim · Romance

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Multiple Endings · Dating Sim

Blood Code
Shared: Visual Novel · Female Protagonist · Otome

My Vow to My Liege
Shared: Female Protagonist · Otome · Visual Novel

Volcano Princess
Shared: Female Protagonist · Multiple Endings · Visual Novel

灾厄黑龙与谎言公主
Shared: Visual Novel · Otome · Female Protagonist

Love Curse: Find Your Soulmate
Shared: Visual Novel · Female Protagonist · LGBTQ+

Class of '09: The Re-Up
Shared: Visual Novel · Female Protagonist · Dark Humor

Senren * Banka
Shared: Visual Novel · Dating Sim · Romance

ATRI -My Dear Moments-
Shared: Visual Novel · Romance · Dating Sim

Folie Fatale
Shared: Otome · Visual Novel · Female Protagonist

Mirror 2: Project X
Shared: Visual Novel · Female Protagonist · Multiple Endings

彷徨之街 The Street of Adrift
Shared: Visual Novel · Female Protagonist · LGBTQ+

Hakuoki: Kyoto Winds
Shared: Visual Novel · Otome · Female Protagonist

BAD END THEATER
Shared: Visual Novel · Multiple Endings · LGBTQ+

The Three Kingdoms: Rebirth
Shared: Visual Novel · Dating Sim · Romance