There were no reports of any issues in the latest build. So that's that... it's done. It'll be off to press shortly.
In the meanwhile, I've already starting planning a new game engine for any future platformers that might come along. This one worked well, but was limited in terms of environmental shaping... that really showed when it came time to do slopes. This new game engine design is based on subtile collision micromapping, as opposed to the Yuki engine which is based on whole tile collision, so true pixel-perfect collision can be done, and things like slopes are a freakin' breeze. It's a bit more math-intensive, but the PCE isn't a mathematics lightweight so I don't really see it being much of an issue.