Now that I got your hopes high - no, this time it's not some new feature with a cool-sounding name :--D
It turns out that, after last month's OpenGL downgrade, our FPS limiting system stopped working in some specific cases, which means that some people who downloaded the newest demo may have found it to be... rather fast. Not only the gameplay would mean 20 second stages with barely visible bullets and character movable only from corner to corner, but also menus would be almost impossible to select from.
Needless to say, this is now fixed, so if you encountered it, do give the game a try again!