You're not the first person to ask me this very question which is flattering, but... no, I have no plans to develop it further. It's not exactly the kind of game I want to make and I already have one other project in mind (that I'm a bit obsessed by). I used Feeble Fire mostly as a training exercise. I forced myself to make a game that relies on a bunch of features I'm not that good at or experienced with (3d animations are definitely my weak point, I'm not that experienced with AI and while I do enjoy a good combat system I'd assume that a good percentage of my future creations will be non-violent or at least not that combat focused). Thank you so much for asking though! BTW, I played your game just now and it was a thoroughly enjoyable experience. I'm a fan of games that try to put the player in this sort of a relaxing, meditative state (Sir Percival Drinksalot style :P ). Even though the gameplay is vastly different it reminded me a bit of the game called Refunct.
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Well, this is coming from a failed guitar player who's idea of keeping the rhythm involves playing the riff up to 10 bpm slower or faster than what is required, so take it with a grain of salt, but the gameplay didn't feel 'disconnected' from the music. I didn't feel precisely connected either though. Something in between I'd say.