Why leave out 50% of browsers? Isn't this kind of like Raphael, only less useful for real-world scenarios (without cross-browser support)?
I like library, but I feel like there's no way I can use it.
You should ask questions on the mailing list, through email or over Twitter.
We are not forcing anyone to use this library who cannot use use it for whatever reason. We are looking forward, not back, and want development on this to be fun. This rules out any solution for IE8 and below. But are these 50% of browsers? I highly doubt it.