Games like The Heft Effect
Games like The Heft Effect include Date Everything!, Dream Daddy: A Dad Dating Simulator, Senren * Banka, Our Life: Beginnings & Always, and Tricolour Lovestory. We matched them by the tags players give The Heft Effect on Steam (Visual Novel, LGBTQ+, Romance, Singleplayer, and 3D): closest matches first, and among equally close ones the better-known games.

Date Everything!
Shared: LGBTQ+ · Romance · Dating Sim

Dream Daddy: A Dad Dating Simulator
Shared: LGBTQ+ · Visual Novel · Romance

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

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

Tricolour Lovestory
Shared: Visual Novel · Dating Sim · Romance

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

LoveChoice
Shared: Romance · Visual Novel · Dating Sim

恋爱绮谭~不存在的夏天~
Shared: Visual Novel · LGBTQ+ · Mystery

Lucy -The Eternity She Wished For-
Shared: Visual Novel · Romance · Dating Sim

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

Fox Hime Zero
Shared: Visual Novel · Romance · Singleplayer

Monster Prom 2: Monster Camp
Shared: LGBTQ+ · Dating Sim · Visual Novel

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

The Sims™ 4
Shared: Romance · Singleplayer · Dating Sim

Florence
Shared: Romance · Casual · Singleplayer

Doki Doki Literature Club Plus!
Shared: Visual Novel · Dating Sim · Romance

Gaokao.Love.100Days
Shared: Visual Novel · Romance · Dating Sim

Sweet Home
Shared: LGBTQ+ · Visual Novel · Dating Sim

Mirror 2: Project X
Shared: Visual Novel · 3D · Singleplayer

Kitty Powers' Matchmaker
Shared: LGBTQ+ · Dating Sim · Casual

Flowers -Le volume sur ete-
Shared: Visual Novel · LGBTQ+ · Romance

Until Then
Shared: Visual Novel · Romance · LGBTQ+

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

Aokana - Four Rhythms Across the Blue
Shared: Visual Novel · Romance · Casual