I've been fooling around with Tilemancer for about an hour. Really cool utility. Thanks for making it!
My #1 complaint is that the color ramp in the Colorizer node is much, much too cramped. Without fail, the actually-relevant divisions are all cramped together, so half of the ramp is jam-packed with dividers, and the other half is totally unused.
From a user perspective, I can get around this to some extent by creating a custom "Add Contrast" node that gives a color balance more suitable for the color ramp, but ideally, this would be addressed at the UI level. Rather than the existing line-with-points-on-it, I'd love to just see a list of [contrast%, color] nodes. Anything that gives finer control over the output would be great by me, though.
Thanks again! This really is a great tool.