Sea of Stars is a retro-inspired turn-based RPG with a New Game Plus option that can be unlocked after beating the game once. In this mode, players can retain their level, gold, Rainbow Conches, recipes, ingredients, weapons, armors, valuables, base skills, combos, and relics. However, there are not too many incentives to complete the game in this mode, except for earning the "What a Technique!" trophy, which requires defeating 10 bosses with the Artful Gambit relic on New Game Plus.

Sea of Stars also has a confirmed DLC that was originally part of the stretch goals for the successful Kickstarter, but there is not much information about it at the moment.

As for the games ending, there is a true ending that requires players to complete certain prerequisites, such as defeating the Battle Arena in Brisk and rebuilding Mirth. There are also many optional bosses and side missions that can lead to a more satisfying true ending. However, some players have criticized the story and ending, giving the game a 7/10 rating.

In terms of product details, there is no information available on the ingredients or materials used in the game.