Honestly this game isn't that bad, the music is a bit annoying.
Next time try to make the gameplay more easy and let it get harder along the way if you're gonna make a sequel. The graphics are a bit lacking, but i like how some textures switch but it happens too fast to truly appreciate the effort. a different obstacle type wouldn't hurt either just make sure to introduce them properly. A simple score or a better distance counter would add depth in to the game. Seeing that this is your first game, and you understand it isn't good. but with some work and practise you can make it amazing. I wish you luck in game making adventures.