I really like the drawing style, and the music is relaxing and overall a good fit for the game. I can see the inspiration from games like Getting Over It, and the idea is sound in a vacuum. However, I don't feel like it fits with the limitation very well, as i interpreted it as the player is unable to move or be moved, though I can accept this interpretation.
While the aesthetic and music is really well done, I feel like the gameplay isn't quite there. The difficulty itself is good, if not amazing, but the way it's played doesn't feel as polished as it should. The lack of momentum alone makes movement feel too jarring and unintuitive, and when encountering obstacles the player keeps moving at the same speed along the original vector, making it jump around and then snapping back to the line, instead of changing course or stopping. It feels as if the movement was the least looked after aspect of the game, when it should be its most polished. With a game such as this, a platformer with its main goal being its difficulty and satisfaction, movement is key, and each failure should feel like the player's fault thoroughly, but this game's movement feels like it was coded in an hour or two and left like that.
That being said, the rest of the game is really well done, with special mention to the music and drawing. To give some tips, I would like for the movement to receive more love, adding momentum alone would give it a better feel, but using acceleration and deceleration, along with proper interaction with the world could give it spice and make it feel much more polished. Thighs I would've liked to see are bumping when colliding with objects, sliding off smaller obstacles like rocks to bounce you off course and momentum along with acceleration and deceleration.
These are just my opinions of course, other people may disagree with me and they would be right in doing so, that is perfectly valid. I still stand by my words.
All in all, a solid submission, and better than most games I've played here, if tainted by bad movement.