1. Hidden Voices is a Power you learn from Lyx
2. Your saves will automatically transfer between versions (just make sure you don't delete the game if you're on Android!)
3. Sure, typo and bug reports are always useful! I'm most active on Discord, so posting in the CK server's #bug-reports channel is most effective
4. Don't worry about not having money to support the game - I'm just happy if people play it and enjoy it!
Hope that answered your questions :)