Here's the new gameplay update which revolves around masks' mobility.
v0.12 adds an additional attribute to masks called Movement Type which affects some masks mobility possibilities.

Perhaps in future updates, this game mechanics will be given much more attention.
Also, some masks have undergone minor changes.
In addition, a small number of new items have been added to the game.

Additional levels are still in development, but surprises can be expected in the next updates.

Among other things, an official wiki page was created for the game, which, although still in development, already describes in detail the game mechanics and gives recommendations for playthrough.

[MOVEMENT TYPES]

• Walking: Default movement type
All masks not listed below are of this type.
• Crawling: Suffers movedraining when walking through obstacles. Gains and loses movedraining much faster.
Next masks assigned to be Crawling: Aaron, Radop, Gudozaj, Flegmin, Jomo, Poancl
• Flying: Overflies obstacles. Doesn't get affected by movedraining. Void Grue catches you faster.
Next masks assigned to be Flying: Anemona, Zazzar, Rooks
• Incorporeal: Doesn't get affected by obstacles or pushing
Next masks assigned to be Incorporeal: Bisma, Undal, Xzavax, Sierptal, Agaegt

[GENERAL]

• Fortune influence on positive random outputs was decreased by additional randomization.
• Some boss rooms' shape were changed
• SFX for some bosses were added
• Final boss fight stage was redrawn
• Special Bar upgrades were renamed in Energy upgrades
• Some props spawn in void

Breach Mode:

• Enemies' attack interval is randomized
• Enemies' projectiles are more durable
• Noise Echoes aiming on player on attack, what makes them terrifying enemies once again just like before v0.9

• despite the latest rumors there is no cow level sorry

[ITEMS]

• Number of Items increased by 6 (from 102 to 108)
Artifacts: Feather, Bone, Propulsor Anomalies: Exostance, Engine, Leg

[Reworks]

• "Guillotine": now it temporary weakens enemies with less than half of health on hit for 1 second
• "Reactor": old effect of Reactor was put into new artifact Engine

[REWORKED MASKS]

• Damage dealt to enemies by melee AoE regular attacks is decreased depending on the angle difference.

Bisma

• Permeation was changed as it became obsolete due new movement type.
New passive ability "Earthbound": regenerates energy on the ground but quickly drains it in the void.

Varoi

Multi Cleave
• Decreased radius of attack

Aaron

• Movedraining is nullified when Aaron in a web

Kelstr

Scope Aim
• Changes movement type to Crawling

Tarraxt

Paroxysm
• Changes movement type to Incorporeal

Lieden

Stereokinesis
• Changes movement type to Flying

Minor graphic edits, a complete revision of the text of the game, as well as additional work with sound are expected in the next minor update.
Upd: I decided to skip the minor update to jump straight to the major update.
There will be some core gameplay and balance changes in the next update.
Sorry to keep you waiting.

Plans for v0.13 (approx. 2021 Halloween Sale):

• Work on W4: Eerie Zones
• Add stage condition of W4: Hallucinations
• Add more props on Eeries Zones
• Polish or rework magic/evil-themed masks and Forbidden masks too
• Polish or rework some artifacts
• Add Angst Mode, an extremely difficult mode which wipes your progress on game over