Really nice game! I had fun playing this and it worked very smoothly. I liked the palette and you polished the details really well (parallax, screen transitions, the low-pass filter on crashes, etc.). I also liked how there was an alternative path to take. In further development, you might consider rewarding the player (in points or similar) for moving more quickly through the board, or add jumps that require speed; as it stands, it felt like a benefit to skate in a way that slowed you down (e.g., riding through bumps rather than jump them, hitting lips, etc.), so that the difficult jumps didn't come at you so fast. Then again, maybe that would kill the chill vibe that people have enjoyed...
Nice job!