Update v1.22:
H.P. LOVECRAFT
H.P. Lovecraft difficulty is now available! H.P. Lovecraft is Song of Horror’s hardest difficulty level. You can unlock this new difficulty after beating the game for the first time in M.R. James or Edgar Allan Poe.

The unlocking of H.P. Lovecraft is not retroactive: it won't unlock automatically if you already completed the game on M.R. James or Edgar Allan Poe. However, what you can do is watch the final cutscene again to unlock H.P. Lovecraft.
H.P. Lovecraft is a global unlock. Once you obtain it, you’ll be able to select H.P. Lovecraft in any of your save slots.
In H.P. Lovecraft, death (or worse!) lurks around every corner. The difficulty of all five Hauntings has been noticeably increased, and they will appear slightly more frequently than in Edgar Allan Poe. Lesser events will also tend to be more... malignant than before.
Be on your guard! No tutorials will show up in H.P. Lovecraft (they are still accessible from the "Tutorials" section of the Pause menu), and you might find yourself facing dangers you didn’t expect.
For those achievement hunters among us, you can now unlock a brand new one for completing the entire game on H.P. Lovecraft difficulty: "The Presence waits dreaming".
You can also change difficulty at any time between H.P. Lovecraft and the other three difficulty levels with no restrictions. However, doing this will prevent you from getting the achievement associated with H.P. Lovecraft, so think carefully before committing.
EPISODE 5: NEW PLAYABLE CHARACTER AND EVENTS
Erica Fдrber is now playable in Episode 5! After going through unspeakable horrors at the Abbey of Saint Cecilia and the antique store, a final answer still eludes Erica, and as you know, she’s not one to sit idly by...

To unlock Erica as a playable character in Episode 5, she needs to be present in Episode 4 and survive the ordeal (she doesn't need to be the one who finishes the episode). This is not retroactive: it will unlock on successful Episode 4 runs from now on.
We also added several instances of random paranormal activity to Jeremy Hartwood Mental Hospital. Now, your adventure through this cursed place will be scarier than ever before!

THE ABYSS
Fixed a rare bug where dodging an arm grab in the last second could result in your character still being grabbed and the associated icon not being properly shown.
GENERAL
Fixed several translations and minor bugs.
Fixed a bug where a certain combination of button/key presses could send you flying towards the last door you interacted with (The Presence can be really silly if it wants too).
Fixed several minor sound issues.

Update v1.14:
EPISODE 4
25 new paranormal events: St. Cecilia's Abbey is officially the most haunted place in Song of Horror. You can expect more scares than ever before!
An original collectible: The Tarot Deck. Find five fate-altering confessions from those consumed by The Presence to resist its most lethal attacks.
New cutscenes + animation fixes: We introduced more cinematic moments and tweaked several animations from characters during said scenes.
A new illustrated cutscene at the end of the episode, adding more context and emotion before the last episode.
The "Ornate keys" now combine into a single item upon having more than one of them.
Blocked a door that should not have opened from the start (It was The Presence trying to mess with us!)
The Scriptorium blocked door can now be opened from the inside, more exploration possibilities!
Removed Cold event from St. Cecilia's Abbey: we feel this manifestation of The Presence was redundant, and that this Episode's pace benefits from its removal.
Deeper color scheme: both the interiors and exteriors of St. Cecilia are now visually enhanced
Improved sound ambient: events, animations, and scenes display better sounding effects
Several bugs fixes, gameplay tweaks, and quality-of-life improvements throughout the whole episode.

EPISODE 3
Tweaks on Interlude: End of the Road. We reworked the main puzzle of Husher's Interlude to add more depth in both its explanation and solution.
A new cutscene at the end of the Episode involving The Presence (spooky!)
Lightning enhancements in the Great Library: to improve the final section of the Episode

Update 2(v1.11):
GENERAL
Fixed a graphical bug that caused sharp FPS drops on camera change.
Fixed a bug with the selection of additional personal items and collectible items on character select that could cause your choices to not be reflected in-game.

THE ABYSS
Fixed a problem making The Abyss harder than intended.
Fixed a bug which was causing the icons marking the dodge window for arm-grabs to not display at all.
Fixed the character uttering a lot of phrases on overcoming The Abyss.
Overcoming the first Abyss should now grant an achievement.
Fixed a bug which could cause the wrong camera to be chosen after overcoming The Abyss.

EPISODE 3
Fixed a problem with The Door causing it to graphically glitch on spawn.
Fixed a bug with The Silence causing the thing to not get closer when it should.
In the Archive, After exiting the white screen door, your character should now hold their light source correctly.
The painting child should now properly despawn in the Newspaper Archive.
Fixed a bug which wouldn’t reset the difficulty of releasing yourself in the Great Library upon losing a character.
Fixed an unintended use of Maxwell’s Lucky Coin which would cause your character to freeze.
The broken camera in the Great Library shouldn’t break more than once anymore.
Fixed being able to fix the camera before it actually breaking.
Fixed several loading issues in The Great Library.
Husher’s Haikus should now have matching text and image.
Introduced a lot of new sound effects and fixed many more.
Fixed a bug which could cause your selectable characters to be incorrect. Restarting Episode 3 (or any earlier episode) should now fix this issue for players still experiencing it. Also, Husher won't be Daniel anymore 
Fixed several audio bugs.
Added some missing wall collisions in the Interlude.
Changing between slides in the projector puzzle is now done manually so everyone can choose their preferred rhythm.
Fixed a shelf interaction in the Archive that would freeze your character upon completion.

Update 1:
no changelog was posted.