Cool and challenging game! I ended up playing multiple times to beat it. The mario kart style powerups were a great addition, adding some strategic choices to the race! I liked the sound effects for the horses, I wish there was some sound effects when using powerups :D
I was a bit confused by the perspective, it's a mix of top down (when running up/down) and from the side (when running left/right). Other then that the visuals were really charming!
Great game!