love the art, just a couple of tips:
Right now there is no reason to use the swing mechanic, every rock can be avoided by jumping, so maybe adding something like longer rocks that require you to swing could spice up the gameplay a bit;
The game kinda feels slow, increasing the gravity, speed and jump force would make it faster and upbeat.
Other than that, nice work! Again, the art is really good. Rated, feel free to check mine out whenever you have the time👀