New Steam Leaderboards! See how you rank against the world
New bosses for Ice and Steampunk worlds
New guns including the Gyrojet, Kill-O-zap, and Electro-Shock, Suppressed Glock
New passive items and synergies, including electric bullets
New music for Ice and Steampunk worlds
Dozens of new rooms with integrated hazards
Many visual improvements, specifically for the Ice level and the Level Selection ship
Many technical fixes and gameplay improvements
Version 0.4.0 Major Update!
Source: Steam Community (opens in a new tab)