I absoloutly love the idea and the art scheme/colors, especially the day/night cycle. The horse looks so cute and pretty!
Here just some tiny suggestions:
- set your pixelart to "Point" Filter, it will not be blurry anymore
- I love the idea of the foreground layer, maybe you could move the layers at different speeds to make the game even more immersive
- animate the wheels, add dust particles
- I personally prefer a destination you get closer to, a goal
you did a great job!