full changelog is here: https://mysteriousspace.com/changelog/0-9-x/

here are some highlights:

additions:
* added haunted worlds, and a new mini-boss which may sometimes appear there: the ghost baleine
* a new mini-mini-boss: Mini Menkalinan
* a new type of crate, and a chance to find weird crates just lying around on planets

changes:
* the appearance of mini-bosses (the big flying ship, the whales, the worm, etc) is now a bit more regular. you can expect to fight a few in every game!
* the placement of shops is now a bit more regular; you'll hopefully encounter them more frequently, and not all bunched up in a clump

bug fixes:
* electric crates were dealing way too much damage; this has been fixed
* fixed a crash related to selling weakened regenerating armors (thanks to a mysterious someone for reporting this via the crash reporter!)

again, check out the changelog for the full list of changes: https://mysteriousspace.com/changelog/0-9-x/

and thanks - as always - for playing Mysterious Space! :)