I played your game with a xbos controller, I like the idea of your game but honestly the lack of control when I want to change direction with the character is annoying, specially because the obstacles are very close to each other which require a precision is hard to deliver. I think that should be the first part you wanna address if you want to improve the game, maybe check games like 1080 avalanche or Tony Hawk Downhill Jam to get some ideas on that regard.
Another opinion I have (is just a personally idea) is: make the game with a futuristic design, something like Nitronic Rush, I think it will fit very well. You can check that game if you want, if I recall, it's free and I think is similar to what you want to make: a single player game with many tracks with many obstacles.