Not just a gimmick. This game has a compelling story and wonderful atmosphere

This was a lot of fun and I enjoyed the story quite a bit. I liked the focus on the Guardians as a team both in gameplay and story. I almost stopped playing early on because the combat was really frustrating and repetitive, but it gets a lot better once you're leveled up a bit and have unlocked some abilities

It's a better introduction to some main characters than the main game but the actual plotline seems very inconsequential. It's super short and free though so you're not losing much if you play it and don't like it