Well since you already said this is an early demo I'm only going to say one thing about the graphics: There is a serious clash of art styles. The Title Card looks great but your main character is a pixel art sprite while everything else seems to be watercolor/vector textures.
You can see a clear divide of the background image; it seems like you used a non-repeating sprite.
Gameplaywise:
-Background continues scrolling even when it's game over.
-Collision doesn't always work, I've had instances where character passed through the big trees no problem but gets game over with the small ones.
-Flags which I assume get you points sometimes spawn way to the edge of the screen with hardly any space left for your character to pass through.
OK- thanks for the feedback!
I said the graphics need work and this is just a demo. Style will be adjusted and the opening screen made to look better. I am looking for pixel art to match the player.
The background keeps scrolling because player is still skiing.
Collisions are very accurate my friend and your player wraps from one side to the other.
The collision is at the trunk of the tree not the branches and you can fly over and through trees if you hit a ramp first but effect is time limited.
If you hit something it is maybe because you need practice not because of collisions being off
BUT thanks for playing and hope you have a better day!