Source: Steam Community (opens in a new tab)
All the new things that come with this version, Early Access 3.0,0:

NEW FEATURES
- Original soundtrack
- - Music by scenarios
- - Different music for boss
- Backstab
- Spawn in multiple locations
- Improved AI of NPCs
- Improved animations of combo attacks
- Sellers appear in different positions
- Player can move with open inventory
- Enemies hear player noise
- Option to change camera control axes
- Enemies can patrol
- Persistence of settings
- Improved UI in game: subtitles, market, controls
- Pick up weapon from the ground, dropping the current
- Castle setting
- Bailey scenario
- Made new ending in game
- NPCs can give item to player
- Allied NPCs attack enemy and vice versa, when seeing
- More help and new UI for in-game menus
FIXED
- Empty potion now doesn't appear on the minimap
- Refactoring of game codes
- NPC speeches through the menu
- King scenario could be
- NPC friend, you speak now only through the inventory
- Sometimes enemy gets dead standing up, and enemy does the parry without animation
- Enemy floating on sloped terrain.
- Improved procedural scenario generation algorithm
- Aim enemy behind the wall