Its simple but effective gameplay. The music was a good fit and it was nice to see that it transitioned between scenes smoothly. In addition, the overall art style was simple but still conveyed everything it needed to for the player to understand what was going on, especially the character who has a basic design that works well within the context of the game. The movement felt alright and the levels were designed really well to compliment the movement (also the line that follows the player was a really nice touch).
That being said there are a few things that I think would have improved this game a lot. To start, I think the jump felt inconsistent around the ramps/hills (probably due to the ground check not always working with slopes). On top of that, I think the player could have had some better player feedback such as turning around when moving left, a jump sound, and possibly a small animation effect when jumping (squash and stretch). Also, I noticed there were some collectables throughout the game (mainly the first level), but it was never clear if they did anything.
Overall the game was still enjoyable, and I'm exited to see what you do next. And as a side note, good job on the itch page!