It's a cool game to learn to code but not to play ;)
So what's missing? Mainly player feedback. A menu or lobby in wich the player can feel home. There isn't anything that want's me to play the game. I don't know what coins are for and how many levels there are. If there are such things then you have to make some sort of tutorial to make this clear. I hope you can improve those things in youre next game :).
This probably also helps when you didn't know why the game doesn't feel great.