Ive added this to th HN Arcade https://hnarcade.com/games/games/skiflee-an-html5-game
You might consider a mechanic where moving your character in a sinusoidal pattern works like building up blue sparks in Mario Kart rewarding the player with a temporary speed boost.
Another SkiFree homage that was posted a while back on HN that has a nice pixel art aesthetic: