This is a really great idea for a game. The idea of different abilities activated by "drawing" them reminds me of an old DS game called Lost Magic. One minor issue I have is with the "recharge" time. It's a little slow, which is a problem with some of the puzzles, especially those involving the hammer, which requires a lot of bones to use at all. Messing up on the shape, or missing the target, can leave you waiting for quite awhile to try again. The presentation is great, it reminds me of a Game Boy game. The page mentions that this is a proof of concept, I would love to see the idea fleshed(pun definitely intended) out more.
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In all honesty, I should've ditched the magic bar altogether. With so many planned ideas cut, it serves no function right now.
I actually remember looking up Lost Magic a few months ago for a different project. If I end up working on Flesh & Bone, I think I will add this magic system, too. Thanks for the suggestions!