I'm working on something similiar myself.
Seeing as Iceguy is making on too, makes me kinda worried but oh well.
My tool isn't for creating entire sprites, but just the graphics routine.
I mead a thread about this earlier but oh well Linky
Anyway, my tool might not be able, to give the sprite any behaviour, on the other hand, it doesn't matter how many tiles the sprite consits off.
I'm planning to release this for this years C3, seeing as it the tool is mostly finished.
Anyway, I just, once again, wanted to ask for feedback on usefullness and how much you guxs think it's needed.
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... what even am I doing with my life?