It's often hard to talk about the stability builds, because there aren't a ton of visual changes.
This build has no new levels; no obvious visual tweaks; etc, but it is full of QOL adjustments and fixes... with more to come. By this I mean there were a number of smaller fixes that didn't make it into this release but will be part of 0.5.0-early_access.
On top of this, I've been heavily testing the final batch of levels, and I think these are the best of the bunch. I did decide to remove one of these levels just yesterday... because it sucked, but otherwise I am loving the final few levels of the game. These will not be part of any early access build (final release only), but as I test these levels, I'm finding much that can be improved throughout the game. After all, the final levels are the most complex by far!