This game looks really pretty, I love the graphics. Although it's missing sounds/music. That's the only reason why I didn't give you 5 stars for aesthetics. Sounds would also help with teaching how to play, I had to stop the game once, read instructions again to get the idea that different things happen when you release button quickly or hold it. I would realise it instantly if the game told me that with different sounds :)
I would say game matches the theme because of fire used as a weapon and it's needed to light your path except... the latter isn't really true :D enemies eyes glow in the dark, level end goal glows with different colour and camera is always focused on player. Light is only allowing you to see pretty background and player's silhouette!
I enjoyed it, couldn't get past level 6. I believe it would be really awesome game if expanded!