OMG, this game is so good! I can totally picture it as a full release, it's already so addictive. I really enjoyed the level mechanics, the music fits the game perfectly, and the graphics are very nice. I also loved the way you recharge your spark, and the glass mechanic to protect it is such a great idea. It actually reminded me of the glass dome protecting the rose in The Little Prince, which I thought was a really nice touch. The lighting is beautiful as well.
I also loved the little animation at the end, haha!
I really hope you'll continue working on this project and turn it into a full game because it has so much potential. I could easily see it becoming a polished, high-quality game. Amazing work!