No cloud saving right now. Maybe one day... You can transfer save files manually. `Android/data/com.dinaki.kt/files`
Patron code works for one version. For the next update there will be a new code.
Paid mods work if you have a correct code for a current version.
I don't remeber why exactly I had to send you the code. But you should try to download the next update from Itch. Perhaps it will work like expected.