I think this is a game that, with a little more polish, could be really solid. Like many others said, the complete silence is pretty jarring, and some music and sfx would add a lot. Other than that, the core mechanic of using your light source as an attack is pretty neat. I do wish that it wasn't quite so costly to fight the dragons though; it takes pretty much the entire un-upgraded light bar to stun a single dragon. Since the whole game is about looking for keys and that's impossible without light, it feels a little frustrating to lose all my light because I wanted to fight one enemy. It would also be nice to have some checkpoints; getting most of the way through the game only to die in a single hit from a dragon is pretty disappointing. This is a very workable game concept though, and I think if you could resolve these issues then this would be a very enjoyable!
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I'll admit I didn't give myself enough time to really code and debug and sound got cut for it, and it's still far from perfect on the code front. Several of the problems you mention are actually from this, you're actually supposed to have 2 HP that comes back when you get back to a light, and gets upgraded with the light bar. And I did consider check points but an issue with the dragons made the work a little harder than I thought was reasonable in the timeframe I had.
Thanks for your input! It's really good.