yep!
don't worry: 0.9.3's save games are compatible with 0.9.4. the reason I jumped up a whole version number is that this isn't just a bug fix release! it adds a VERY IMPORTANT FEATURE:
custom key bindings! (for keyboard only.)
thank you to everyone who's hassled me to implement this! :P it's never been high on my priority list, but after hearing from a couple people who REALLY NEEDED IT, I realized it should have been! so I got it together as quickly as I could, and rather than wait until the end of the month to release it, you get it now!
the system could use a little polish, to be sure - I'll get to that for the next release - but it works!
there's also a couple little UI fixes, a little buff to the Angry equipment (added for fun, not because I felt the buff was necessarily needed), the usual bug fixes, and some other tidbits.
you can find the full changelog here: 
https://mysteriousspace.com/changelog/0-9-x/thanks for reading, and thanks for playing Mysterious Space! :)