I have played a few times and gotten to the 2nd island with some upgrades. Any time I come back to the main screen of the game "Continue" is greyed out and I can only start a new game? How does one save their progress?
That seems to be an old bug, please first of all make sure that your game is up to date.
If it's up to date, then restart your console and you should be able to save normally.
- Holding down the power button for a few seconds
- Selecting Power Options
- Selecting Restart