If you're one of the three people on Earth who played the old version of this game, here's the change notes.

Stability

• Fixed Windows 10 framerate issues.
• Fixed spurious OpenAL-related startup failures.
• Fixed OpenAL assert when adjusting sound volume after playing the game.

Graphics

• Fullscreen mode now uses a maximized borderless window instead of changing screen resolutions (but requires restarting the game.)
• The game window will no longer be cut off when running in fullscreen mode on monitors with unexpected aspect ratios.
• Bloom effects are less overwhelming in fullscreen mode.
• Fixed graphical artifacts on triangle seams when antialiasing is on.

Gameplay

• Added warning message when the player takes too long to complete a level and Hunter-Killers start to spawn.
• In addition to stunning enemies, smart bombs now grant 5 seconds of invincibility.
• Ordinary powerup storage containers now have a very, very small chance of dropping rare items, and there is a slightly higher chance of encountering rare powerup containers in World 1.
• Slight improvement to loot on the secret level.

Misc

• Fixed bad joypad defaults for Xbox 360 controllers.
• Tweaked default volume settings.