Very interesting idea, I like it, in a way (though, I think the mechanic could be a better fit in a bit different game).
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I mean, the mechanic itself is fine, but using it in dark caves (in which you have to react quickly to enemies and water droplets), while also having to manage energy was just a less than ideal fit.
I would love to see this mechanic in a slightly slower game and full visibility. Either way, I think it was a very interesting game.