Oh my bad, cat is in the casino.
1.0.4 has more bug fixes and stuff while also adding some more content and quality of life, there is a bit more content but it mainly will add the final dungeon and boss as well as all the endings, so you could just wait until full release later this year.
Also saves can be transfered to newer versions, this also applies to the public full release of version 1.0 as well^^