Nice and simple. I really like the cute little animation when he walks. I got stuck a few times and died before I realised where the bounds of the level were. I like it how you can't just spam the shooting fire or you die.
The only thing that really stood out to me was the music. It restarts everytime the game does and is a little annoying if you die alot (like myself haha). Put it in a DontDestroyOnLoad so it's seamless between plays.