Well, where do we start...

What's new:

Two new characters

Futanari Option!

Expanded gameplay and puzzles

New character and shotgun models

New gates for a harder experience

Ducts now are locked, unlock it by finding a key

Interactive female partner

New original music

Options menu for changing resolution and volume

Auto Exposure for light

4k Textures for ambience

Direct Shadow Raycast

Optimizations (removed alot of useless shaders and etc)

Underground!

New mission from Sayana

Modified ducts

Press the posters 10 times...

New model for Dove

New name for Toy Righty - Dove

More information for the player

Inventory system fixed (I think)

AI fixed and improved

Expanded map

New sounds

Now you can skip cutscenes and the intro!

Colored doors! (matching the color of the cards)

Collision with doors fixed...

Game optimized with Dynamic Occlusion

Others... (secret or irrelevant)

Edit: Bad title name, sorry!