Auto-detection of joystick or gamepad. The flicker-free two-color 48 pixel kernel, which I think was first publicly seen in a May 2011 build of Frantic, was originally developed in 2010 for the Stay Frosty 2 logo at the top of this screen.
Broom = Double Jump, Present = Bonus Points. Levels use full width of screen. In contrast, Stay Frosty didn't use PF0 so the upper platforms never appeared on the left or right edges of the screen. Platform color is also updated on all 3 scan lines, Stay Frosty platforms look flat by comparison.
Watchout for Firebirds, they're hot. Status line alternates between Score and Lives/Level. The firebirds look awesome in motion (@ 0:33).
Elevators can take you places. Branches can move Walls
Carrot = Snowball, note the Carrot Nose when powerup has been collected. Throwing a snowball is done by hitting UP on a standard joystick, or a secondary button if a gamepad was detected. Gamepads that are known to work include Amiga CD32 Joypads and Sega Genesis Gamepads (both 3 and 6 button).
Taking a piece of Coal from the Bucket lets you see the invisible.
But beware, fireballs love coal - they'll take it from you and become stronger. First image is after the bottom-right fireball took a piece of coal from you, second image is after it took another piece from you.
Lava Platforms are also hot, Snowflakes restore ice. Corn Cob Pipe = Icy Snowman (slower melting). Lava platforms shimmer over time.
Gas Cans are not your friend, they reignite extinguished fireballs.