Heres a couple games that i believe are similar THOHH (by various degrees) that i have personally played myself
PKINADS PRISON and FATTENING by J8867bbw/Debyjull (RPGMAKER)
These games were created to celebrate twitter follower milestones and are short RPGMAKER “Find The Gameovers” sort of games.
Themes similar to THOHH include: Bondage/Stuckage | Non-consensual Protagonist weight gain/Stuffing | Slob/Sweating | Immobilism | Creepy atmosphere/Elements
GAINING PERSPECTIVE by GeekDragon (HTML Twine)
Already suggested by Generic_Humanoid but I will include anyway.
Gaining Perspective is a very “Black coffee” sort of Weight gain game: Dark, Simple, Effective.
Most of the darker elements come from how realistic its depiction of Weight gain is.
In line with this realistic depiction of Gaining,
Consequences for Gaining are equally depicted,
you will break chairs, you will struggle to move, your health will become a increasing obstacle in your way the more you decide to let yourself go.
Themes similar to THOHH include: Dark themes | Stuffing | Slob/Gas (Written, no audio) | Immobilism/Health issues
ENTHRALLED by JarbyJarbat (HTML Twine) (NON FORUM)
Technically this is more of a “Hypnosis/Mind Control Focused” game than a Weight gain game but it still features scenes of either Weight gain and or implied Weight gain.
[ Implied refers to something that doesn’t happen in the active story but is implied to have happened ]
this game also features a very dark (but well written) story with themes of:
Death, Loss of self, Loss of free will and more.
because of the harsh themes i will not directly link this game, and only recommend you play it if you are comfortable with those themes.
Weight gain Relevant themes include: Protagonist Stuffing (Implied/Endings) | Npc Stuffing (Implied) | Immobilism (Npc, Protagonist endings) | Protagonist Burping (Singular ending, Written) | Both Non Consensual and (Dubiously) Consensual Protagonist Weight gain (Implied/Endings)
I have doubt that Trickee will return, atleast anytime soon. but if they do i hope they will continue to make unique works like THOHH, because it was a great ride even if it reached the stop early.