For the last month or three, I have been maintaining and testing an experimental branch of the game with a bunch changes, mainly changes to the game engine, but some content additions as well.
Today, that change goes live.
In my testing, I observed that the engine changes result in significantly less CPU usage. (I suspect an update to the version of Python and switching to SoLoud for sound are both be contributing to this.)
Also, there is a bit of new content and some minor improvements. Plus the usual barrage of typo fixes.
And probably crashes, because engine changes. There's a new crash reporting system: it no longer requires you to send a crash report over email, you'll be asked if you'd like to post a crash report via Discord.
(For anyone who ran experimental, thank you; I did get a handful of crash reports. I expect to still throw updates into the experimental branch, from time to time, as it amuses me to. So you might want to stay on experimental in hopes of seeing some random new thing in the future, but for now all the updates have been rolled out.)