If I buy the game, can I use the freeware savefiles ? I am enjoying the game a lot so far. Also wondering if you plan to expand on the universe ?
No, sadly you won't be able to use the files. You can always finish the freeware version and then play on the hardest difficulty on the Steam version for a different experience or something. You could also use cheats to select the level and attempt to restore your gear.
Next update will land somewhere in July, and I hope to add the paid version here on itch as well.