That is a really polished game and it runs incredibly good on web. I like that you did a cut-scene in the beginning which also expresses the base gameplay mechanic very well.
I also find it very interessting that you use batteries like "bullets". In general I like the whole idea how you have designed monsters. They are hard to spot - but not too hard. They make you feel uncomfortable but it always feels kind fair.
I'm not a horror-game-player. So it is hard for me to give any advices in that direction. But to me this game looks pretty solid. If I were you I would think about putting that on steam.