Oh thank you so much! ^^
1. It is yes!
2. This is as Kira said, the pod becomes accessible after you beat Nightmare and lets you go back to Sablee and Auria, you can find it in the very top right of the Rietti plains ^^
3. There are 13 Power orbs in total!
Damn, I didn't realize Patreon was straight up inaccessible in some parts of the world... I uploaded the walkthrough here in case you need it: https://mega.nz/file/CwtB0ZrI#kkqsYmVjKk2ZuyQDGtExrdUD8S9u9aZKpEgEQuUzZWE
Thank you again!